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睡
1
Idiomatic expression
to be extremely sleepy; to be at the brink of falling asleep
1
REM sleep
Examples
REM睡眠中の脳波は起きている時と同じ脳波であり、夢を見るステージです。
The brain waves during REM sleep are the same as when awake, and it's the stage when you have dreams.
