You went to bed at a reasonable hour. You slept for seven, eight, maybe even nine hours. Yet when morning arrives, you feel as though your body never received the memo that it was supposed to recharge.
If this happens regularly, the problem may not be how long you sleep. It may be what is happening during those hours.
Restorative sleep depends on much more than simply being unconscious. Your brain needs to cycle normally through different stages of sleep, your breathing needs to remain stable, your nervous system needs to settle, and frequent mini-awakenings need to be kept to a minimum.
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