I want to sleep.
我要睡覺
I need to have a rest.
我要休息
go to bed /go to sleep是指動作，要去睡
fall asleep 指的是狀態，睡著了
take a nap
小睡
feel sleepy
昏昏欲睡的，想睡覺的
sleep enough 睡飽
A.Do you sleep enough?
B.Do you get enough sleep?
你睡飽了嗎?
I can't sleep. 或者 I can't fall to sleep.
睡不著
wake up 與 get up的區別
wake up 單指從睡夢中醒來
get up 不光指醒來，還包含起床這個動作