Why do I wake up at 3 a.m.?

Yes. Mayo Clinic-style sleep guidance generally explains consistent 3 a.m. awakenings as a mix of normal sleep-stage changes, stress or anxiety, alcohol or lifestyle factors, and sometimes medical issues.

Common reasons include:

• Normal sleep architecture: The second half of the night contains more lighter sleep and REM, so it’s easier to wake up from small disturbances.
• Stress or anxiety: When your mind is more activated, you may wake more easily and have trouble falling back asleep.
• Alcohol or other lifestyle factors: Drinking in the evening can disturb sleep later in the night, and other habits can also fragment sleep.
• Age-related changes: Sleep often becomes lighter and more fragmented with age.
• Possible medical causes: Sleep apnea, needing to urinate at night, reflux, hot flashes, pain, or other conditions can also wake you.

If you wake up, it can help to avoid looking at the clock and to keep the environment calm and dim while you try to relax back to sleep.

If this happens often, or if you also have gasping, loud snoring, daytime sleepiness, chest pain, or it’s been going on for weeks, it’s worth checking with a doctor or sleep specialist.