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 Related words 
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 Related words 
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| 昼寝(recess after lunch) > | 
| 睡眠(sleep) > | 
| 深呼吸する(breathe deeply) > | 
| 息(breath) > | 
| 生理現象(physiological phenomenon) > | 
| 内分泌(internal secretion) > | 
| 眠りにつく(fall asleep) > |