You saying you are a nightowl
.....
It may be cultural.
In some countries they have a sleep in the day a nap and have late dinners (10 pm on weeknights even :0 )
It could be habit or lifestyle ex. if one works nights or has favorite tvshow on at a late time and incists on watching.....
Maybe they want to sleep but cant or actually dont want to...
Could be outer noise or disturbances..
I had difficulties sleeping for many many yrs and was taking sleep tablets daily for it and Drs told me I should.
Was clearly addicted as without them could not sleep and body twitched and pulled in billion directions and hurt and stresslevels in body were atrocious.
All I wanted was to sleep cause then I had peace, no hurt etc
I decided to quit sleeptablets.The Dr said "no no continue" but I had made my mind up so went through withdrawal a long long time,
Now yrs later I am free from tablets (yiihaaa) and sleep beautifully and looooove sleeping
I go to bed early though even on weekends.
I looooove sleeping and need it dearly cause lots been happening.
Not sure what you are refering to in your question but the reasons are many and different lifestyles, cultures, circumstances etc