Yep, like just like everything else, not everything works for everyone. I've been awake for 26+ hours to the point I'm hallucinating and still unable to fall asleep. But apparently I just have to wait till I'm tired enough. As if being awake for 26 hours straight isn't enough? I also can generally make it so I can be awake at the right time if left to my own devices. Which is why I'm really glad I'm out of my parents house, because they would decide "you've been sleeping long enough" and wake me up an hour after I fell asleep.