Why Do I Keep Waking Up at 3 a.m.? Common Causes and Fixes
Stress, alcohol, a full bladder or a sleep disorder can all wake you in the small hours. Here's how to work out why — and get back to sleep.
Medically reviewed by Lena Hartmann, PhDWritten by Sam WhitfieldUpdated on
Key takeaways
- Brief night-time awakenings are normal; it's a problem when you can't get back to sleep or feel unrefreshed.
- Common culprits include stress, alcohol, needing to urinate, reflux, a warm bedroom and sleep apnoea.
- For long-term insomnia, cognitive behavioural therapy for insomnia (CBT-I) is the recommended first treatment.
Waking in the early hours and lying there, wide awake, is frustrating — and very common. Sleep naturally gets lighter in the second half of the night, so it's easier for small disturbances to wake you.
Common causes
Stress and anxiety
Worry can keep your body in a state of high alert. Once you wake, racing thoughts make it hard to drift off again.
Alcohol
A drink may help you fall asleep, but as your body processes alcohol, sleep becomes more fragmented in the second half of the night.
Needing to urinate
Waking to use the bathroom (nocturia) becomes more common with age. Drinking a lot in the evening, certain medicines and some medical conditions can contribute.
Your bedroom
Heat, light, noise or a partner's snoring can all wake you. Most people sleep best in a cool, dark, quiet room.
Hormonal changes
Hot flushes and night sweats during perimenopause and menopause commonly disrupt sleep.
Sleep apnoea
Repeated pauses in breathing during sleep cause brief awakenings, often without you realising. Loud snoring, gasping and daytime sleepiness are warning signs.
Low mood
Waking very early and being unable to get back to sleep can be a sign of depression.
What to do when you wake up
- Don't check the time. Clock-watching adds pressure.
- Keep lights low and avoid your phone.
- If you're awake for about 20 minutes, get up and do something quiet and relaxing in dim light, then return to bed when sleepy.
- Try a slow breathing exercise such as box breathing.
Habits that prevent early waking
- Get up at the same time every day, including weekends.
- Limit caffeine after midday and alcohol in the evening.
- Get daylight in the morning and stay active during the day.
The takeaway
Most 3 a.m. wake-ups have a fixable cause — stress, alcohol, a warm room or a full bladder. Consistent wake times and calm night-time habits help, and if insomnia persists, CBT-I is highly effective.
How we reviewed this article
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- Watson NF, et al. (2015). Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society. Journal of Clinical Sleep Medicine. https://doi.org/10.5664/jcsm.4758
- Qaseem A, et al. (2016). Management of Chronic Insomnia Disorder in Adults: A Clinical Practice Guideline From the American College of Physicians. Annals of Internal Medicine. https://doi.org/10.7326/M15-2175
- October 10, 2026Written, medically reviewed and published. Medically reviewed by Lena Hartmann, PhD.
Medically reviewed by Lena Hartmann, PhDWritten by Sam WhitfieldUpdated on
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