asleep/ə'sliːp/

a. sleeping

a. [不能置于名词前] 睡着的，熟睡：He fell asleep (= started to sleep) as soon as his head hit the pillow. 他头一触枕就睡着了。

◇be sound asleep 正熟睡着

◇be half asleep 半睡半醒

构词a- + sleep

常犯错误

✗ an asleep boy

✓ a sleeping boy 熟睡的男孩