結果 : what age does sleep problems start

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1:43

Reasons Why Seniors Don’t Sleep Well at Night | Senior Sleep Problems

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What causes insomnia? - Dan Kwartler

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0:58

What Happens to Your Brain When You Sleep?

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4:48

A walk through the stages of sleep | Sleeping with Science, a TED series

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What happens when we sleep?

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A Simple Solution for Quickly Returning to Sleep at Night

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How to Fix Your Sleep Schedule

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Sleep deprivation test with a spoon - are you sleep deprived?

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8 時間の睡眠は必要ではない理由を医師が解説します。

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夜勤の仕事はしていますか? #睡眠

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What would happen if you didn’t sleep? - Claudia Aguirre

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Why do you like sleeping like this so much?

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This is how you can achieve PERFECT 100% sleep score every night.

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How to fall back asleep in the middle of the night

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