A strange thing happens. This is at least twice. When I am completely exhausted mentally and have to tap out, as I did Wednesday, to recover, there is a void in my life. I miss USMLE. D-2 and I worked Monday through Wednesday and haven't worked yesterday or today. I don't know what to do with myself. I get a little depressed. I can't read my normal fare. USMLE to me is in a way semi-addictive. I still dream about it, dreamt about it last night, even though I could not have resumed study today. It is really strange.