Brumation is the reptile version of hibernation, and it scares more first-time bearded dragon owners than any other normal behavior. A dragon that was hand-feeding and basking in October suddenly buries itself in a corner in November, stops eating, sleeps for days at a time, and looks like it is dying. Many owners rush to the vet, only to be told the dragon is fine and entering a natural cycle. Brumation is normal, healthy, and usually safe, but it does have a list of warning signs that genuinely separate sleeping from sickness. This guide walks through what to expect, what to adjust in husbandry, and when to actually call the vet.
What brumation is and why it happens
Bearded dragons evolved in the central Australian outback, where winter temperatures drop and food availability collapses. The species developed a metabolic slowdown that lets them survive the lean months on stored fat. Captive dragons retain the instinct even though their tank temperatures may not signal the season clearly. Triggers include:
- Shortening daylight hours (most reliable trigger)
- Slightly cooler ambient temperatures
- Internal seasonal clock that runs roughly on a year cycle
Brumation typically starts in October to December in the Northern Hemisphere and ends in February to April. Southern Hemisphere dragons brumate June through September.
What brumation looks like
Behavior in a brumating dragon, in rough order of progression:
- Late autumn: Appetite drops, the dragon eats half its usual portion
- Early brumation: Spends more time hiding, stops greeting at the glass
- Mid brumation: Sleeps 18 to 22 hours daily, may bury itself in substrate
- Late brumation: Mostly motionless, eyes closed, breathing slowly
- Emergence: Wakes up for water, walks around for an hour, returns to sleep
- Post brumation: Appetite gradually returns over 2 to 4 weeks
The dragon should look the same physically before, during, and after brumation. Body condition stays stable, the fat pads on the hip do not visibly sink, and the eyes stay clear when open.
Husbandry adjustments during brumation
Most owners overreact and change too much. The recommended adjustments are mild:
Lighting and temperature:
- Reduce photoperiod from 12 hours to 9 to 10 hours
- Keep UVB tube running (a dragon will emerge briefly and benefit from it)
- Reduce basking temperature by 5F (from 100 to 95F) if you want, or leave as-is
- Maintain cool end at 75F minimum
Substrate:
- Leave a hide on the cool end so the dragon can bury or burrow naturally
- Solid substrate (tile) is fine, but a dragon brumating on tile may move to a corner under decor for the same effect
Hydration:
- Offer fresh water in a shallow dish at all times
- Mist the enclosure lightly twice a week, focusing on the dragon’s hide
- Consider a 10-minute lukewarm bath once a week to support hydration
Feeding:
- Offer salad once a week, remove uneaten portion within 60 minutes
- Offer 1 to 2 insects once a week, only if the dragon shows interest
- Do not force-feed under any circumstance
Warning signs that mean a vet visit
A brumating dragon should not lose meaningful weight, should not show physical symptoms, and should wake up for water at least once a week. Symptoms that mean stop assuming brumation and call a reptile vet:
- Visible weight loss. Hip dimples sinking inward, tail base looking thin, or skin tenting when gently pinched.
- Runny or discolored stool. A brumating dragon poops rarely (every 2 to 4 weeks) but the stool should look formed and dark. Yellow, green, or watery stool means infection.
- Sunken eyes. Severe dehydration. Bath immediately and call the vet.
- Open-mouth breathing or wheezing. Respiratory infection regardless of brumation state.
- Trembling or twitching. Possible MBD episode triggered by metabolic slowdown plus residual calcium deficiency.
- Sudden weight loss in under a week. Internal parasites or impaction.
- Failure to wake for water for more than 14 days. Severe metabolic problem.
Document the dragon’s pre-brumation weight by weighing on a kitchen scale, then check every 2 weeks. A loss of more than 10 percent body weight is a red flag.
Common owner mistakes
The errors that turn safe brumation into a sick animal:
1. Forcing food. Hand-feeding a brumating dragon causes undigested food to sit in the gut at low temperatures, which can rot or cause impaction. If a dragon refuses food, accept it.
2. Turning off the heat entirely. A dragon needs the option to thermoregulate even during brumation. Some dragons emerge for a basking session before returning to sleep. Killing the heat entirely removes that option.
3. Repeatedly waking the dragon. Picking up a brumating dragon to “check on it” or moving it for photos increases stress and wakes a metabolism that is supposed to be slow. Resist the urge.
4. Treating it like a juvenile. Brumation in dragons under 12 months is unusual and almost always pathological. A small dragon that “brumates” is usually sick. Call a vet rather than assuming it is normal.
5. Skipping baths entirely. Hydration matters even in brumation. A weekly 10-minute lukewarm bath (95 to 100F water, shallow enough that the dragon’s nostrils stay clear) supports kidney function without disturbing the sleep cycle for long.
Coming out of brumation
The exit is gradual, not sudden. Signs that brumation is ending:
- The dragon spends more time in the open
- Glass surfing or interaction with you returns
- Appetite reappears, often with a strong eating session after weeks of refusal
- Eyes stay open and alert for longer stretches
- Pooping resumes on a normal schedule (every 2 to 7 days)
When the dragon comes out, gradually restore the full 12-hour photoperiod and full basking temperatures over 1 to 2 weeks. Offer food more frequently but resist temptation to overfeed. The gut bacteria need a week or two to ramp back up, and a sudden full feeding load can cause loose stool.
Schedule a fecal exam with your reptile vet within a month of brumation ending. The metabolic slowdown can let internal parasites multiply that the dragon’s immune system would normally suppress, and a routine deworming after brumation is a smart preventive step.
Veterinary disclaimer
This guide describes general bearded dragon brumation patterns observed across the species. Every dragon is different, and the line between normal brumation and illness can be subtle. If your dragon shows any of the warning signs listed above, or if you are uncertain about behavior, consult a licensed reptile veterinarian. Do not substitute online guidance for an in-person exam, particularly for weight loss, breathing changes, or post-brumation health checks. See our bearded dragon setup and care guide for the full husbandry foundation that supports a healthy brumation cycle.
Frequently asked questions
How long does bearded dragon brumation last?+
Typically 4 to 12 weeks for healthy adult dragons over 12 months old, though some go 16 weeks. Juveniles under 12 months rarely brumate, and if a small dragon shows brumation signs, it is more likely illness than dormancy. Length varies year to year for the same dragon.
Should I keep the UVB on during brumation?+
Yes, but reduce the photoperiod. Drop from 12 hours to 8 to 10 hours during brumation. Turn off the basking bulb during the day if the dragon is hiding constantly, but keep the UVB tube running so the dragon synthesizes D3 when it does emerge for water.
Should I feed my dragon during brumation?+
Offer food once a week and remove uneaten portions within an hour. Most brumating dragons refuse food entirely. Never force-feed a brumating dragon. The metabolic slowdown means undigested food can rot in the gut, causing fatal impaction.
How do I know if it is brumation or illness?+
Brumation includes sustained sleeping, low activity, reduced appetite, and normal stool when it appears. Illness signs are different: weight loss visible at the hip dimples, sunken eyes, runny or undigested stool, lethargy combined with skin tenting, or trembling. A healthy brumating dragon wakes for water, walks around briefly, then returns to sleep.
Can I prevent brumation?+
Yes, by keeping a constant 12-hour photoperiod and stable basking temperatures year-round, but most experienced keepers let the cycle happen. Dragons that brumate often have longer lifespans and better breeding outcomes. Forced absence of brumation is associated with reproductive issues in females.
Related product reviews
Arcadia ProT5 UVB Review (2026)
REPTI ZOO 36x18x18 Glass Reptile Terrarium 50-Gallon Review (2026)
Zilla Reptile Habitat Lighting UVB Fluorescent Desert Review (2026)
Alex Patel
Alex Patel writes for The Tested Hub.