Utouto Suyasuya -

Kaigi no aida, utouto shite shimatta. (During the meeting, I ended up dozing off.)

(すやすや) is the onomatopoeia for the sound of peaceful, rhythmic breathing—the sound of a person sleeping soundly and safely. utouto suyasuya

This mimics the state of dozing or nodding off. It represents that specific moment when your eyelids grow heavy and you begin to lose consciousness. Kaigi no aida, utouto shite shimatta