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Secrets to a Better Night’s Sleep

Is Eight Really Enough?

Is Eight Really Enough?

Individual sleep needs are unique — some people need less sleep, some need more to feel rested. In addition to logging your total sleep, note how you feel each day. Seeing the words "productive and energized" or "exhausted and irritable" will clue you in to your magic sleep number.

By Daniel Halperin. Published October 15, 2010.