sleep more easily than before, making it harder to stay asleep through the night. This heightened sensitivity contributes to the common phenomenon of waking at the same hour consistently.
Circadian Rhythm Shifts
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Another key reason lies in changes to the circadian rhythm, the body’s internal clock. With age, many people begin to feel tired earlier in the evening. If someone falls asleep at 8:30 or 9:00 p.m., their body may naturally complete a full sleep cycle by 3:00 or 4:00 a.
