fall asleep

动词 fall asleep:

1. change from a waking to a sleeping state
   同义词：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.
   她躺在沙发上很快就睡著了。
2. He fall asleep over the book.
   他看着书睡着了。
3. Because I am tired, I fall asleep quickly.
   因为我很疲劳，因此很快就睡着了。
4. If I fall asleep at the wheel wake me up.
   如果我开车时睡着了，就叫醒我。