Waking up at 3 or 4 AM all the time may not be as harmless as you think.

Here are some common reasons it may be happening.

Hay thức giấc vào 3-4 giờ sáng cảnh báo bệnh gì?

1. Your Sleep Cycles May Simply Be Bringing You to a Lighter Stage of Sleep

Sleep isn’t one continuous state.

Throughout the night, your brain moves through repeated cycles involving non-REM and REM sleep. Earlier in the night, deeper non-REM sleep tends to make up a larger proportion of the night. As morning approaches, lighter sleep and REM periods generally become more prominent.

During lighter stages of sleep, you’re easier to wake.

This means a small disturbance that wouldn’t wake you during deep sleep may wake you later in the night.

You might briefly wake because of:

A noise
Temperature changes
Your partner moving
A dream
Needing to change position
A full bladder
Light entering the room

Sometimes you don’t even remember waking.