Phrasal Verb – Nod Off
The phrasal verb 'nod off' means to fall asleep momentarily, usually during an activity.
Example: I nodded off during the science lecture.
I nodded off in the cinema, so I missed the end of the movie.
We usually use the phrasal verb 'nod off' when the head falls forward when sleepy.
Watch a video of a baby nodding off while watching TV...