I find I have trouble shutting my eyes completely. Also, prednisone keeps you awake (and I took 20mg accidentally tonight as it looks exactly like my new medicine, hence why I'm still up). I used to use a light mask to help sleep. My new medicine regime is putting me into deep sleeps, though. Its also making the MG worse, though, as they've found I have one disease that makes muscles weak and another that makes them tight.