a.  睡着的 ≠ awake

• fast/sound asleep  睡得很熟的

• fall asleep  入睡；长眠

• half asleep  精疲力尽的；睡眼惺忪的

• asleep at the wheel/switch 

  漫不经心的〔以至不好的事发生〕

• Dr. Sasaki found, as expected, the participants slept less well on their first night than they did on their second, taking more than twice as long to fall asleep and sleeping less overall.

• She found birds and dolphins remain alert while asleep. 睡觉时仍然保持警惕

• Grandad fell asleep watching TV.

  爷爷看电视睡着了。

BrE /əˈsliːp/ 

NAmE /əˈsliːp/