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What time should I go to bed so I don’t wake up tired? Use our sleep calculator to find outEnter the time you’d like to wake up in our tool below and, based on 90-minute sleep cycles, we can tell you the best times to go to bed to wake up feeling fresh.
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The 4 Stages of Sleep: What Happens During Each CycleREM stages and one REM stage. Ideally, you repeatedly cycle through each stage. Learn how long each stage lasts.
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