nod off
US /nɑːd ɑːf/
UK /nɑːd ɑːf/

1.
quedarse dormido, cabecear
to fall asleep, especially unintentionally
:
•
He kept nodding off during the boring lecture.
Se quedaba dormido durante la aburrida conferencia.
•
I was so tired, I almost nodded off at my desk.
Estaba tan cansado que casi me quedo dormido en mi escritorio.