Sleep and guilt

Hello! As the exam is in a week, idk i am unable to control my sleep, sometimes 5-6hrs sleep, sometimes like 7-8hrs like today ( I was on anti depressants earlier and have GAD for a long time. I only study for like 6-7hrs now, I have got 160-170 in GT. I don’t know why it’s on my nerves that i’m doing something wrong. I feel weird. Idk, if i am being too causal, i’ve seen people being really strict with themselves(online) but here i am, still sleeping for 7hrs ((