Why do many elderly people wake up at 3 a.m. and what might it mean for their rest?

2. Shifts in the internal clock (circadian rhythm)

Another common cause is a shift in the body’s internal timing system.

Many older adults feel sleepy earlier in the evening. If someone goes to bed at 9:00 p.m., their body may naturally complete its sleep cycle around 3:00 or 4:00 a.m.

This isn’t always insomnia — sometimes it’s simply a new rhythm.

The shift can become more noticeable when:

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