Maybe you carved out the time to get your full eight hours, but you tossed and turned all night. To fully recharge, your body needs to reach a state of deep sleep, which is believed to play the biggest role in restoring energy. During this state of sleep, your blood pressure and pulse rate drop, as compared to the more active stage of REM sleep when you dream. If you're not getting enough shut-eye and feeling the effects in the morning, try to evaluate what choices might be getting in your way, like late-night caffeine.
Caffeine also takes about 10 or 12 hours to completely disappear from the bloodstream, so consuming it in the late afternoon or evening can prevent you from getting those critical hours of sleep [source: Liu].
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