When you get your sleep schedule set, all the other things might look better too. Sleep deprivation affects your whole body and mind.

One good way to reset your circadian rhythm is to force yourself to stay awake a whole night and day. Then get to bed at a reasonable time the next night, say 10 and if you wake up, don't get up. Stay in bed and try to go back to sleep. Get up at 6 or 8 or whatever is good for you. Keep to the same hours and you will probably develop the habit after a few days. It is ok to take a sleeping pill, just make sure you observe the hours whether sleepy or not. This is a good way, but doesn't work for everyone.

If you are under a doctor's care be sure to follow his instructions.