Wake up at 3 a.m.? What your body is saying

Habitual humans. Once you establish a habit, it's hard to break. If you formerly had to wake up at 3 a.m., your body may be used to it.

You go through sleep phases all night. Depending on your phase, you may wake spontaneously.

Sleep apnea, a disorder characterised by disrupted breathing, could cause 3 a.m. waking.

Some booze before bed may help you relax, but it can impair your sleep and wake you up at night.

As alcohol is metabolised, sleep is interrupted, explains Dr. Kapur.

Having sleep problems around 3 a.m. could be a circadian rhythm disturbance. 

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