But anyone who has flown between the East Coast and West Coast of the US knows that the sun doesn't determine when you feel tired or when you wake up: your sleep hygiene does.
I used to fly to SF from Boston and wanted to go to bed at 7-8pm every night and then would wake up at 4am. Not because of sunlight but because my body was used to that schedule.
But anyone who has flown between the East Coast and West Coast of the US knows that the sun doesn't determine when you feel tired or when you wake up: your sleep hygiene does.
I used to fly to SF from Boston and wanted to go to bed at 7-8pm every night and then would wake up at 4am. Not because of sunlight but because my body was used to that schedule.