They are alert at bedtime and sleepy when it is time to get up, and this may have nothing to do with how fatigued their bodies are, or how much sleep they must take to lose their fatigue.
他们在睡觉的时候很清醒，到了该起床的时候很困倦，这可能与他们的身体有多疲劳，或者需要多少睡眠才能消除疲劳无关。
Tony didn't take the drumming lesson because he was sleepy.
托尼没去上击鼓课，因为他很困。
If you take ipecac when you're overly sleepy and your gag reflex isn't working well, you can turn a manageable overdose into something much worse.
如果你吃呕根的话，当你过度沉睡时，你的呕吐反射会很糟糕，一个简单的问题被你弄得更复杂了。
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