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You spend about twenty-six years of your life asleep. Here are five things your sleep is trying to tell you.

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Number one. Hitting snooze does not help. Those extra nine minutes break your sleep cycle, so you wake up groggier than before.

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Number two. Coffee has a half life of six hours. That afternoon cup is still half active in your blood at midnight.

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Number three. Your brain washes itself at night. During deep sleep, fluid flushes out the waste that builds up while you think all day.

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Number four. Screens lie to your body. Phone light after dark tells your brain it is still noon, and delays your sleep by an hour.

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Number five. Short naps win. Twenty minutes restores focus, but a full hour leaves you foggy. Tonight, give your brain the night off.