結果 : during which stage of sleep are you in deep sleep when it is tough to wake up
3:42

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2:45

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4:48

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5:40

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9:41

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7:11

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0:39

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70 回視聴 - 9 か月前
0:28

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0:28

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1:54

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124,706 回視聴 - 13 年前
5:14

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1:00

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Dr Sermed Mezher
508,201 回視聴 - 1 か月前
2:04

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86,158 回視聴 - 3 年前
1:58

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7:57

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0:48

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105 回視聴 - 1 年前