what should i do if i have bad sleep before an exam?

my sleep is genuinely so cooked and im not sugar coating it. the issue is i try to sleep early but i wake up extremely easily- like someone could cough in the middle of the night from a different room and i would wake up and it takes me too long to fall asleep. this happens for periods of times then my sleep goes back to normal but unfortunately i am in this state rn and have my actual maths exam next monday since my skl does it earlier.

I would chug caffeine but the issue is i seem to have two different side effects for it- i either get really sleepy or hyper and i dont know if i can risk getting sleepier.

What should i do in this situation this sunday night?