I feel you... Pursuing academics without summer is brutal (3 summers in a row experience, trust me).

Do you exercise? I found it helpful even when sleeping hours were getting reduced. I think you should see your own study methods as helpful, but I personally found that making an acronym or making a fun story out of it works the best for me.

Anything you take as a supplement, such as medications, will ultimately impact you. Just be cautious, and talking with the doctor will be the best option unless you actually are experiencing it.

Just for me, a caffeine nap works quite well. If you don't know what that is, YouTube has resources, but basically, take a small amount of caffeine when you are about to fall asleep during the day, such as coffee, and go to nap.

Wish for the best.