睡着，进入梦乡
to start to sleep
I fell asleep as soon as my head hit the pillow. 我头一沾枕头就睡着了。
She usually falls asleep within ten minutes of going to bed.
The movie was so boring, I actually fell asleep for a few minutes.
His shoulders slumped and I realized he had fallen asleep.
I can promise you that no one has ever fallen asleep in my classes!
See also: asleep