Grammar fix
nod off
fall asleep sitting up
To fall asleep briefly while sitting or standing, often with your head beginning to droop.
phrasal verb
How oftenCommon
LevelB1
Used inSpeech & writing
Hear it in context
Notice where the phrase sounds natural.
He nodded off on the train and missed his stop.
When I was a student, I sometimes nodded off in afternoon lectures if I had not slept well the night before.
Fix the pattern
One small grammar move makes it sound right.
Not: I nodded on during the meeting.
Say: I nodded off during the meeting.
The sleep expression is 'nod off'; 'nod on' does not have this meaning.
Don't confuse it
Other ways to say it
Fall asleep without meaning to
How specificAny positionHead drooping
drop offEspecially British: fall asleep, often while watching television or resting.
nod offYou're here · Often sitting upright, with your head beginning to droop.
doze offA light, short sleep, often in a chair.