Gathered so it makes sense
Written to explain, not to persuade — the facts as plainly as they can be put.
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Sleep is not a single uniform state. It is a sequence of stages that repeat in cycles through the night, and the proportions of those stages change gradually with age. Slow-wave sleep, the deep phase that supports physical restoration and memory consolidation, tends to occupy less of the night in later adulthood. Awakenings become more frequent, and the threshold for waking from noise or discomfort lowers. Understanding these shifts helps separate ordinary age-related change from patterns that may deserve closer attention.