一整壶咖啡都没法让我提神不瞌睡。

A whole pot of coffee couldn't keep me awake.

youdao

如果你不瞌睡，而且你发现自己无法立即入睡，那么立即起来，让你的头脑保持清醒一段时间。

If you aren't sleepy and find yourself unable to fall asleep quickly, get up and stay awake for a while.

youdao

同时，年纪大的人常常睡不沉，夜里时常醒来，这可能使他们白天经常打瞌睡的原因。

Also, older people often sleep less deeply and wake up more often throughout the night, which may be why they may nap more often during the daytime.

youdao