Edit1: some thoughts based on comments. I was diagnosed with low vitamin D a few months ago but took bills. Maybe a month ago I ran out. I thought getting outside more recently was enough. You all inspired me to be more serious about it. Got my vitamin D3 and b12 pills.
Also, I noticed the two days I felt so tired I slept later and had alcohol too late in the night. One drink but around 12am. I think not just sleep quantity but when I sleep and quality matter.
Will aim to take my pills, not drink after 8-9pm if I drink, and sleep before 11pm.
Thanks for all the advice :)
If I go to nap for 10 minutes at 12:00 and then at 17:00, the next day I’m guaranteed to be sleepy both at 12:00 and 17:00. That’s how circadian rhythms adjust themselves. The only way to not be sleepy at 12:00 and 17:00 on further days is to overcome sleepiness and NOT give in.
I dunno, I occasionally have a mid day nap, but not often. Never had a problem like that. Definitely varies person to person though