動詞 fall asleep:

1. change from a waking to a sleeping state
   同義詞：dope off, flake out, drift off, nod off, drop off, doze off, drowse off

1. He lay down on the sofa and soon fall asleep.
   她躺在沙發(fā)上很快就睡著了。
2. He fall asleep over the book.
   他看著書睡著了。
3. Because I am tired, I fall asleep quickly.
   因為我很疲勞，因此很快就睡著了。
4. If I fall asleep at the wheel wake me up.
   如果我開車時睡著了，就叫醒我。