That can depend a lot.
It's not only when the sun reaching one's eyes and the amount of light exposure...
But also had to be in concert with one's meal times, bowel movements, intensities of activities, certain dosages/amount of consumption (this even includes hydration), etc.
In my own case, I cannot.
I tried for basically most of my life; striving to be consistent in schedule -- but that's just impossible for me, not even in childhood, not even with regular schedules and commitments, not even before screen times. Nothing. It is even uncertain if I can ever have a sleep study in this lifetime to attempt and treat whatever undiagnosed issues I have with sleep.
I don't know about you, but a fixed "Ideal bedtime" just doesn't work with me.
It doesn't matter if I sleep in this supposed 'ideal bedtime' and wake up in the 'ideal' time consistently -- I'd still wake up feeling crappy everyday and still feel crap the whole day.
It coincidentally happened to me before; sure it made me going to a regularly scheduled work a bit easier (or harder, actually), but that's just all.
All I get is that sleeping by 90 mins cycle is better for me than just counting the hours, or that my meal time is ideally 1-2 hrs before falling asleep.
Any attempts on predicting myself depending on what I consumed, what I did, how much and when, and if XYZ symptoms/state/whatever will or will not likely to happen, etc.
Last edited by Edna3362 on 07 Jan 2024, 10:48 am, edited 1 time in total.