im a healthy 18 year old, i exercise and eat well. im about 5"5 and pretty alethtic.
my problem is that i carnt seem to get to sleep untill really early hours in the morning (somthimes 6-8am) and i sleep until about 5-6pm. when im at college i tend to fall asleep at about 1-2am and waking up at 9am which makes me increadably tired.

i have also noticed that at weekends and on holidays my sleep pattern tend to slowly slip into the 5am-5pm when i dont have to get up for anything. it seems to me that i stay awake longer than i go to sleep for, so my pattern gradually gets out of sync with everyone elses.

i found the only way i can get back into 'normal' sleeping habits (11pm-10am) is to stay awake for 24 hours so that i fall asleep at a 'normal' time. which usually isnt possible.

is there a name for this kind of pattern or something? it would be a great help.
Thank you muchly