“If you’re sitting upright, the lights are on, it’s an engaging movie … and you still can’t keep yourself awake, that might be more of like, ‘OK, I should reevaluate how much sleep I’m getting overall,’” Atwood said.
Article source: https://www.huffingtonpost.co.uk/entry/why-fall-asleep-watching-tv_uk_69c54e69e4b04183741f9c2d