I have idiopathic hypersomnolence, complex migraines, and an unknown autoimmune disease that affects my joints. I cannot take stimulants as I have Mitral Valve Prolapse with arrythmias. I am now on 5 mg. of prednisone and have found it has helped me slightly with staying awake though I feel more agitated. I also have severe short term memory loss which seems worse on the prednisone. Any ideas as to why prednisone would help with the sleepines? Oh yes, my once quick mind seems to be fading away. It really saddens me.