LPT 19M with sleep issues

It has been taking me around 90-120 minutes to fall asleep everyday for the past month and a half. I also have difficulty falling back asleep pmce I wake up in the middle of the night(can take around 60-90 minutes).

I have tried Magnesium glycinate and L-Theanine but haven't noticed anything. I snore while I sleep, but I'm a relatively fit 19 year or male.

I have been listening to audiobooks while sleeping since I was 13, and would fall asleep in 15 minutes and never had anything like this happen for over a week.

It started around 10 days after I took a very important exam, and it has continued despite me getting the results back and having done well. The issues exist even when I travel and sleep in a different location.

I can fall asleep after lunch for a nap with minor difficulty(15-30 mins) but longer than I used to take.

I'm heading back to school in a week and don't want to have sleep issues on top of everything else that will be going on. Wondering if anyone has any idea what is going on or any tips.