The circadian rhythm, often described as the body’s internal clock, also changes with age. Many adults over 60 naturally feel sleepy earlier in the evening and wake earlier in the morning.
If you fall asleep at 9 p.m., waking at 3 a.m. already reflects six hours of sleep. For some individuals, that may simply be their new rhythm.
Retirement, reduced social activity, and lower daytime stimulation can also shift sleep patterns forward. Maintaining regular daytime structure helps stabilize this clock. Morning light exposure, daily movement, and consistent sleep and wake times, even on weekends, can reinforce healthier cycles.
Cortisol and Nighttime Alertness
Some awakenings come with a racing mind. In these cases, cortisol may play a role. Cortisol is the hormone that prepares us to wake in the morning. Ideally, it remains low overnight and rises gradually before dawn.
However, chronic stress, anxiety, or blood sugar fluctuations can cause cortisol to rise earlier than intended. A dinner high in refined sugars may lead to a nighttime drop in blood sugar, prompting the body to release cortisol as compensation. The result is sudden alertness.