singapore rabbits

rabbit only thumps at night in HDB, the SG trigger checklist

updated 14 May 2026

it is 2:30am. somewhere in your flat a single, sharp thud hits the floor. then silence. then another. you already know what it is, and now you are lying awake wondering what set the rabbit off this time. the next morning, a WhatsApp message from a neighbour asking if everything is okay because they heard something through the wall. you have no idea what to tell them because you have no idea what triggered the rabbit either.

this is the nighttime-only thumping problem. it is different from a rabbit that thumps occasionally throughout the day. when the behaviour is exclusively or mostly after 10pm, that pattern is a clue. the trigger is almost certainly something that only happens at night, or something that the rabbit is significantly more sensitive to once the rest of the flat goes quiet. this guide works through the most common SG-specific triggers, how to identify which one is responsible, and what you can actually do about it.

thumping is alarm — the rabbit is reporting something

a rabbit thumps with its hind legs to signal danger to the group. in the wild, it is a warning broadcast to nearby rabbits: stay still, something is close. in your HDB flat, there is no group, but the behaviour is hard-wired. when your rabbit thumps, it genuinely believes it has detected a threat and it is doing exactly what its instincts require.

this matters because dismissing it as attention-seeking leads to the wrong response. the rabbit is not thumping to get a treat or to pull you out of bed. it is alarmed. something in the environment has crossed a threshold that feels dangerous. your job is to figure out what that something is, not to train the rabbit out of the warning signal. if you remove the trigger, the thumping stops. if you do not, the rabbit continues to alarm every time it reappears, and chronic repeated alarms have genuine welfare costs — elevated cortisol, disrupted sleep, and sometimes a progressive shift toward baseline anxiety where the rabbit becomes twitchy and reactive around the clock.

why nighttime-only is a clue

the daytime environment in your flat is noisy in a familiar way. traffic, conversation, cooking, your phone, the TV. the rabbit has mapped all of that and categorised it as safe background. at night, the ambient noise floor drops significantly. sounds that were masked during the day become clearly audible. a drainage pipe rush that your rabbit ignored at noon, because it was competing with three other sounds, is suddenly the loudest thing in a silent flat.

there is a second reason. some triggers only occur at night. the delivery trolley rolling through the void deck at 11pm does not exist at 2pm. the neighbour’s TV that runs until midnight is not running at noon. the security guard’s rounds happen on a schedule that coincides with quiet hours. and the cat that roams the corridor outside your ground-floor flat does most of its roaming between dusk and 3am. so if the thumping is genuinely nighttime-only, you are almost certainly dealing with a nocturnal trigger, an amplified-by-silence trigger, or the rabbit’s own crepuscular biology expressing itself.

the rabbit’s own crepuscular schedule

rabbits are crepuscular. their biology peaks at dawn and dusk, and they often have a secondary active window in the middle of the night. this is not insomnia and it is not a problem. it is the natural rhythm of a prey animal that evolved to forage when large predators are less active.

what this means practically is that a rabbit left alone in a quiet flat at midnight is at peak alertness. its senses are sharpest. it is moving around its enclosure, exploring, eating hay, and actively scanning its environment. this is the window when a subtle sound or shadow is most likely to cross the alarm threshold. a rabbit that is half-asleep at 3pm might ignore a distant sound that the same rabbit at midnight treats as a code-red threat. the crepuscular peak is not a trigger by itself, but it dramatically amplifies how the rabbit processes every other trigger on this list. keep that in mind when you are timing the incidents.

the SG flat trigger checklist

work through this list systematically. do not assume you know the trigger. many owners guess wrong on the first try.

aircon compressor cycle. this is the most common culprit in SG flats and it is frequently overlooked because humans stop noticing the AC. inverter units cycle every 8 to 15 minutes. non-inverter units cycle every 20 to 40 minutes. when the compressor kicks in or shuts off, there is a vibration that travels through the wall or the floor. if your rabbit’s enclosure is against an external wall or on a hard floor near that wall, it will feel the vibration through its feet. rabbits have extremely sensitive proprioception — they can detect subtle floor vibrations that humans feel nothing from. the compressor cycling at 2am in a silent flat is mechanically identical to what it does at 2pm, but the rabbit is far more alert to it at 2am.

ceiling fan vibration. a ceiling fan with even slight blade imbalance creates a rhythmic vibration that transmits through the ceiling structure and into the floor. when you run the fan at a higher speed at night for cooling, the vibration amplitude increases. this is an easy one to test — switch the fan off for several nights and see if the thumping pattern changes.

neighbours’ TV through the wall. HDB party walls transmit low-frequency sound efficiently. bass from a TV or speaker system at 11pm carries through concrete and arrives in your flat as a low rumble that the rabbit detects before you do. the bass frequencies below 200Hz are the ones that travel farthest through structure. if the neighbour is watching a movie with explosions or has a subwoofer, the rabbit may be registering it as thunderclap-level percussion. this is especially relevant if you live in an older HDB block with thinner walls.

refrigerator hum and compressor kick. the refrigerator compressor cycles just like the AC. many owners never notice it. but if the rabbit’s enclosure is in or near the kitchen, or if the flat is open-plan, the compressor kick at 3am in a silent flat can land as a sharp acoustic event. older refrigerators with failing capacitors make a louder, more irregular kick that is more likely to alarm.

drainage pipe rush from upstairs flush. HDB drainage pipes are shared between units. when the flat above you flushes a toilet or drains a sink, the water rushes through the shared stack inside the wall of your flat. at 2am this is a sudden, loud, close-range sound. it lasts three to eight seconds and stops abruptly. rabbits find abrupt stops almost as alarming as abrupt starts. the sound comes from inside the wall, which means the rabbit cannot localise it as coming from a known, safe source. this is a high-probability trigger in flats where the rabbit enclosure is near a bathroom or kitchen wall.

late delivery trolley in the corridor. the last-mile delivery ecosystem in Singapore operates around the clock. platform couriers, grocery deliveries, parcel consolidation trolleys — all of these involve metal wheels on HDB corridor tile at 10pm, 11pm, midnight, and later. the acoustic profile of a loaded trolley rolling over corridor grout lines is a rapid, irregular vibration that reaches the rabbit through the floor. if you are on a lower floor or near the lift lobby, this is worth tracking carefully.

security guard rounds. many HDB estates have security rounds on a fixed schedule. a guard walking the corridor, testing door handles, or speaking on a radio passes by every few hours. the rabbit hears or senses footsteps on the corridor floor that transmit through the structural slab. if the rounds happen at midnight and 3am, the timing will match the thumping incidents.

dogs in another flat. a dog in a neighbouring flat that barks at night — at a passing cat, at sounds from outside, at its own restlessness — sends a sound through the wall that the rabbit registers as predator vocalisation. this is not a subtle trigger. the rabbit does not need to know what a dog is to react to the sonic profile of a bark. the response is instinctive and fast. if this is the cause, the thumping will coincide precisely with the barking, which makes it one of the easier triggers to confirm.

cats outside the window. a cat sitting on the corridor ledge, window sill, or garden below and looking in at the rabbit is a high-alarm event. cats are predators in the rabbit’s evolutionary history, and a cat making eye contact through a window at night can trigger sustained thumping that continues even after the cat has moved on, because the rabbit remains in alarm state for 15 to 30 minutes. ground-floor and first-floor flats are most exposed to this.

geckos on walls. common house geckos, the small ones that live on Singapore walls and ceilings and make the clicking sound at night, move in a way that triggers rabbit prey-detection. a gecko crossing the wall of the rabbit’s room, or the ceiling above the enclosure, is a small fast-moving silhouette in peripheral vision. the rabbit cannot assess whether it is harmless. it reacts to the movement signature, not to the size of the animal. if you have geckos in the rabbit’s room, they are suspects.

cockroaches in corners. a large cockroach moving across the floor near the enclosure at night creates both a sound (legs on tile, a small rustle) and a smell signature. rabbits have an acute olfactory system. a cockroach entering the room activates a sensory profile that, in the wild, would indicate something alive and moving nearby. this can be enough to trigger a thump, especially in a previously quiet environment.

gardener or town council work at 5am. HDB estates schedule grass cutting, drain clearing, and corridor washing in the early morning hours, often starting before 6am. a leaf blower or power washer at 5:15am is an extremely loud, novel sound arriving at a time when the rabbit is in its pre-dawn crepuscular peak. this is worth checking if the incidents cluster around 5 to 6am rather than midnight.

the identification protocol

the goal is to correlate each thumping incident with a specific event in the environment. you need timestamped evidence because your memory will not be precise enough and you will not always be awake when it happens.

phone audio recording. place a phone in voice memo recording mode in the rabbit’s room before you sleep. many phones will record for four to six hours. review the recording the next morning, find the thump sounds, note the timestamps, then ask yourself what was happening in the flat or building at exactly those moments. was the AC running? did someone upstairs flush a toilet?

baby monitor. a basic audio baby monitor lets you hear what is happening in the rabbit’s room in real time without being in the room. ambient sound that precedes the thump — a pipe rush, a distant bark, a gecko click — will be audible through the monitor if you are listening at the time.

IP camera with motion detection. a Tp-Link Tapo C200, Xiaomi Mi Home camera, or Aqara camera placed in the rabbit’s room gives you timestamped video with night vision. set motion detection sensitivity to high. when the rabbit thumps it will move, triggering a recording clip. the clip will also capture the ten seconds before and after, which is often enough to catch the triggering event — the gecko on the wall, the shadow from corridor light, the moment the rabbit looks sharply in one direction before thumping.

run the recording setup for at least five nights before drawing conclusions. one-night data can mislead. you want a pattern: do the incidents cluster at the same time each night? do they cluster after certain events (AC cycles, neighbour activity periods)?

triangulating the time, the trigger, and the rabbit’s response position

when you review the recordings, note three things for each incident: the exact time, where in the room the rabbit was positioned when it thumped, and what direction it was facing. a rabbit thumping while facing the external wall is alarming something from outside or through the wall. a rabbit thumping while facing the corner where the drainage pipe runs is alarming the pipe. a rabbit thumping while looking up is reacting to something on the ceiling — likely a gecko.

cross-reference the timestamp with your building’s environment. if incidents always occur between 11:15pm and 11:45pm, that is your neighbour’s TV being turned off after the late news. if they occur at irregular intervals but always separated by roughly 12 minutes, that is the inverter AC compressor cycling. if there is a single incident each night at approximately 5:20am, that is likely the town council maintenance crew.

fixing each trigger category

once you have identified the trigger, the fix becomes straightforward.

acoustic triggers through walls. add rugs between the rabbit’s enclosure and the wall the sound is travelling through. heavy curtains on windows and external walls add mass that attenuates mid and high frequency transmission. moving the enclosure away from the suspect wall by even 60 to 90 centimetres reduces the perceived intensity significantly.

vibration triggers. place the enclosure on a foam mat or thick rug rather than hard tile. this decouples the enclosure from the floor slab and reduces the vibration the rabbit feels through its feet. enclosures directly on tile act as vibration amplifiers. a yoga mat under the pen is not glamorous but it works.

visual triggers (geckos, cats, shadows). move the enclosure away from walls where geckos congregate. use a light frosted film on windows at rabbit height to block the visual field without blocking airflow. install a night light in the rabbit’s room — a low-lux red or amber light — so the room is never truly dark, which reduces the contrast that makes moving shadows alarming.

pest triggers. eliminate cockroach access to the rabbit’s room. seal gaps under doors, treat with gel bait stations rather than spray (spray residue is harmful to rabbits), and keep the room clean of food debris.

corridor sound triggers. a draught excluder at the base of the door to the rabbit’s room significantly reduces corridor noise transmission. if the thumping correlates with delivery trolleys or security rounds, this is often sufficient.

AC compressor. you cannot stop the compressor from cycling. what you can do is move the enclosure away from the wall that the AC unit is mounted on. if the unit is a wall-mounted split AC, the compressor is outside on the ledge and vibrates the wall it is attached to. a 1-metre clearance from that wall makes a measurable difference.

the AC compressor specific case

this trigger deserves extra attention because it is so common in Singapore and so frequently missed. the indoor unit of a split system AC is quiet. the outdoor compressor is not. at night, especially in the 12am to 5am period when ambient sound levels drop, the compressor kick creates a vibration that travels from the external wall through the concrete slab and into the rabbit’s enclosure floor.

the timing signature of this trigger is regular and tied to room temperature. on a humid Singapore night when the AC is working hard, the compressor may cycle every 8 minutes. as the room cools, the cycles lengthen. if you note your thumping incidents on an irregular schedule that nonetheless clusters during the hottest part of the night, and if your AC is wall-mounted on the same wall as or an adjacent wall to the rabbit’s enclosure, run a test: relocate the enclosure to the opposite side of the room for one week and see whether the pattern changes.

older non-inverter ACs are worse for this because their compressor startup is harder — a full-power surge rather than a gradual ramp. if you are renting and cannot change the AC unit, the foam-mat decoupling fix combined with relocation is your best available option.

when thumping indicates anxiety vs alarm

alarm thumping has a specific trigger and stops once the trigger is gone or the rabbit has satisfied itself that the threat has passed. the rabbit returns to normal behaviour — eating, grooming, resting — within 30 minutes. the incidents are episodic.

anxiety thumping is different. the rabbit thumps with no identifiable external trigger. it may thump repeatedly across a long window, 90 minutes or more. it does not return to calm grooming behaviour between bouts. it may also show other anxiety signs: over-grooming, hiding when not in a thumping bout, refusal to eat during high-anxiety periods, aggressive lunging, or teeth grinding audible to you (distinct from the quiet tooth-purring of a contented rabbit).

if you have run the identification protocol for two weeks, eliminated every identifiable trigger, and the thumping continues, that shifts the differential toward anxiety. this is worth a vet conversation. a rabbit that has developed generalised anxiety — often from chronic repeated alarm, a traumatic event, illness causing pain, or an environmental change that is not obviously linked to sound — may benefit from environmental enrichment changes, bonding intervention, or in some cases medication support. a behavioural vet consultation in Singapore runs approximately 100 to 200 SGD and is worth pursuing if the environmental protocol has not resolved the issue. you can find vets who see rabbits at our vet directory.

the distinction matters because the fixes are completely different. buying another rug will not help an anxious rabbit. and anxiolytic medication will not stop the rabbit from being alarmed by the AC compressor.

the bonded pair complication

if you have two rabbits, the identification problem gets more complex. one rabbit may detect a trigger and thump. the second rabbit, hearing the first thump, enters alarm state and also thumps. now you have two rabbits thumping with no obvious external trigger. to a new owner this looks like spontaneous anxiety when it is actually a social cascade from a real external trigger.

the way to identify this is to watch which rabbit thumps first and which thumps in response. the first thumper is the one detecting the external trigger. the second is copying the alarm signal. fix the first rabbit’s trigger and the cascade stops. if you cannot tell which rabbit is first because you are not in the room, the IP camera recording helps — the first thump will occur before the second, with a visible lag of one to three seconds.

there is also a learned thumping problem in bonded pairs. if one rabbit has developed a habit of thumping at low-level triggers — a rabbit that has become sensitised through repeated alarm — it can teach the other rabbit to thump at the same sub-threshold inputs. this is a genuine welfare concern and another reason to address triggers early rather than waiting for the behaviour to resolve on its own. for more on how bonded pair dynamics affect stress responses, see our guide on rabbit separation anxiety in Singapore.

the neighbour conversation

HDB living means shared sound. if your rabbit’s nighttime thumping is audible to neighbours, you will likely get a message or a knock eventually. here is how to handle it without creating a longer problem.

be direct and non-defensive. explain that you are aware of the noise, that you have identified it as your rabbit alarming, and that you are actively investigating the cause. if you suspect the neighbour’s own TV or dog is a contributing trigger, this is not the moment to say so — deal with it separately through the environmental protocol first. what you want to avoid is the neighbour filing a noise complaint through the HDB branch office or the OneService app before you have had a chance to fix the problem.

if the problem persists and the neighbour is sympathetic, it is worth mentioning that you are trying to identify whether sounds from their side of the wall might be inadvertently triggering the rabbit. most neighbours who understand what is happening will be cooperative about moderate adjustments — turning the TV off at 11pm rather than midnight, for instance. frame it as a mutual investigation rather than a complaint.

if the thumping is genuinely causing your rabbit chronic stress, that is also a welfare issue worth taking seriously for the rabbit’s sake, not just for neighbourly relations.

what owners often get wrong

waiting for it to stop on its own. if the trigger is still present, the thumping will not stop. a rabbit does not habituate to genuine alarm signals the way humans habituate to background noise. the trigger needs to be removed or mitigated.

assuming it is attention-seeking. rabbits do not thump to get your attention in the way a dog might bark. a rabbit thumping at 2am is alarmed, not lonely. going to the rabbit and providing attention after a thump does not reinforce the behaviour — the rabbit is not performing — but it also does not address the trigger. you are treating the symptom by reassuring the rabbit, which is fine, but the thump will recur the next night when the trigger reappears.

recording one night and concluding too quickly. a single night of recording may capture one incident that is atypical. a delivery that only comes on certain nights, a cat that is not regular. run the protocol for at least five nights before drawing conclusions. patterns become obvious over time.

moving the enclosure to a busier part of the flat. some owners move the rabbit to the living room thinking the company will help. the living room is often closer to external walls, lift shafts, and corridor sounds. this frequently makes the problem worse, not better.

dismissing it because the rabbit seems fine in the morning. a rabbit that appears calm the next day may still be accumulating chronic stress from repeated nighttime alarms. the rabbit’s baseline may be shifting in ways you cannot observe without knowing what calm actually looks like for that specific animal. if the thumping is frequent — more than twice per week — treat it as a priority to resolve. for context on what a stressed rabbit looks like, see our guide on rabbits scared of everything in Singapore.

if you are working through the nighttime thumping problem, these guides cover the surrounding territory:

this guide is written for informational purposes. every rabbit is different and individual responses to environmental triggers vary. if your rabbit’s thumping is persistent, increasing in frequency, or accompanied by other signs of distress such as appetite changes, hiding, or teeth grinding, consult a rabbit-experienced vet. a behavioural consultation can rule out pain and health-related causes before committing to environmental fixes.

community-sourced information, not veterinary advice. for medical issues, see a licensed SG exotic vet — start with our vet directory.

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