I am glad its not just me, was beginning to think i had an attention problem.
At school, we'd watch a video in History or Geography, then i'd drop with a puddle of drool on the desk. Only to be woken when the lights flicked on and there being some mention of an essay on the film we'd just seen.............erm.........oops.
Now i am 34 and still can't help nodding off as soon as i am in a meeting, just because someone else is talking and not me...........i took extra strong coffeee in but that never helped, i doodled on some paper i found in my handbag.........heck its awful once you start going.........
I also tried extra strong mints..........
I can only suggest a water spritzer for your face.
Have you ever tried nipping yourself??? I did once when i was desperate to keep my eyes from closing..........its not easy