I have been getting around 8 hours of sleep consistently for the past 3 years. I am almost never feel sleep deprived, but a weird experience I have almost every day is SEVERE drousiness in the afternoon.
This usually start after 4 pm. From then on till 5:30 pm I have the strongest desire to sleep, which I find odd considering I slept 8+ hours the night before. I try to avoid this nap, because if I sleep in the afternoon I CANNOT fall asleep at night and have to stay up till at least 2:30 or 3 am.
What I also find odd is that despite the severe drousiness I experience in the afternoon, I am wide awake when I come to bed at around 11 pm, usually unable to fall asleep before 1 am. Would any of you have an explanation to this? I am aware of the circadian rhythm and the basics of sleep science to some extent.
I'm a 21 year old male who goes to the gym 5-6 days a week and am quite fit. My usual sleep schedule is from 1-1:30 am till 9-10 am.