>only works by blue light hitting your retina, which meant your eye was open, which meant you were awake ie not even trying to sleep.

not necessarily - your eyelids aren't perfectly opaque

>also, circadian rhythms were proven to be unaffected even when living in a cave with no natural sunlight - so theres more to sleepiness than just light hitting your eyebaws

yeah, not disputing this. Blue light doesn't have to be the sole determinant to have an effect though