うとうと

adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'

dozing off; nodding off; drowsing

Describes the state of being half-asleep, often while sitting or in a relaxed position. Commonly used with する or と.

• テレビを見みながらうとうとしてしまった。

  I dozed off while watching TV.