結果 : is 4 hours of rem sleep good
3:42

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The DEEPEST Healing Sleep | 3.2Hz Delta Brain Waves | REM Sleep Music - Binaural Beats

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Relaxing Deep Sleep Background Music - Insomnia & Stress Relief | Sleep Meditation (#22,Frequency)

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The brain benefits of deep sleep -- and how to get more of it | Dan Gartenberg

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REM Sleep - How Much Sleep Do You Need

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Instant Calm, 4 hour Deep Sleep Music, Healing Meditation Music, Insomnia, Sleep, Study Music, Zen

Sleep Easy Relax - Keith Smith
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Soothing Relaxation
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Enter REM Sleep Cycle | Deep Dreaming Sleep Music | Theta & Gamma Wave Binaural Beats Sleep Music

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