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Hippy guy, it gets worse the later you go to bed. I can go to bed on time and it doesn't affect me at all but if I'm already overtired and then go to bed it kicks in every time. If you feel tired, go to bed. Chances are good you'll fall asleep. Stay up too late it will kick in every time. That's my experience of it anyway.
HAHA you sound like my missus, I have always been a "night owl" never want to go to bed early, seems a waste, all the best stuff is on tv,she is forever telling me to go to bed earlier, WELL, I suppose I should give it a try