How sleep architecture and the stress response shift with age, what disrupts them, and where the evidence on repair is strongest.
Waking during the night becomes more common with age, but 3 A.M. is not a mysterious biological danger zone. Sleep naturally becomes easier to interrupt as the night progresses.
Older adults often sleep differently, but that does not necessarily mean they need less sleep. Most still need roughly seven to nine hours.
Snoring is common and does not automatically mean sleep apnea. But loud snoring with breathing pauses, gasping, or daytime sleepiness can signal airway collapse during sleep.
Short afternoon naps can improve alertness and reduce fatigue, while longer or later naps are more likely to cause grogginess and may reduce nighttime sleep pressure.
The stress response is useful when you need it for minutes. Problems develop when cardiovascular, hormonal, immune, and behavioral systems stay activated for weeks or months.
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