After such activities, it is often much easier to feel tired and fall asleep.
在这些活动之后，你会发现你很快会觉得疲惫且很容易入睡。
All these activities can increase alertness and make it difficult to fall asleep.
所有这些活动会提高你的灵敏度，让睡觉变得很困难。
All these activities can increase alertness and make it difficult to fall asleep.
所有这些活动会提高你的灵敏度，让睡觉变得很困难。
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