Waking at 3 A.M.? How Sleep Patterns Often Shift With Age

Waking around 3 a.m. is a common experience for many older adults, often caused by natural shifts in the body.

One of the main reasons for this early-morning wakefulness is the gradual decline of melatonin, the hormone that helps regulate sleep and wake cycles. As melatonin levels decrease with age, sleep becomes lighter and more easily interrupted. Small things—like a slight temperature change, a bit of hallway light, or even minor household sounds—can cause someone to wake up. By the time 3 a.m. arrives, melatonin may be low enough that the brain thinks it is time to get up, even when more sleep would be helpful.