Correct

沉酣

/ chēn hān / 
Strokes

Example

As a Verb

be deeply immersed/steeped/enmeshed (in sth)

1
Shuìmèng
睡梦
chēnhān
沉酣

be submerged in sleep

2
Chēnhān
沉酣
jīngshǐ
经史

be deeply immersed in the study of classical works