1) Catch forty winks 2) Doze 3) Fall asleep in a meeting 4) React to a boring speech 5) React to a dull lecture 6) React to a dull sermon 7) React to boredom 8) Slang for to fall asleep 9) Snooze 10) Start to drowse 11) Succumb to sleepiness 
Nod off is slang for to fall asleep.