I think your flash cards and notebook would not have been exactly as you left them, with "no indication". No, you don't have to piss in trash cans or even fold towels like Lynn P but there will probably be some indication of what you were doing, especially as you dreamed you were using your flash cards. People who sleep eat, leave wrappers and dirty dishes; no one does "complete" things the way they would, I don't think, Lynn P did not put the folded towels away in the correct place, for example. The "I'll do the dishes in the morning" sort of thing holds more sway I think when one is in the throes of sleep and doesn't have the "will" to override and say, "No, get them done now".

If you had not imagined yourself doing your flash cards, you might not know if you had slept walked or not; as Lynn says she does sometimes, you could have just wandered around the house. Sleep walking is often genetic and starts or happens in one teen years.

http://www.medicinenet.com/sleepwalking/page2.htm

However, sleep walking is also considered to include just sitting up in one's bed or sleep talking, etc. I was at a convention in another town and the woman I was rooming with was laughing at me one morning and asked if my husband had told me. I asked, "told me what" and it turned out I had been practicing my public speaking we'd been doing all week that was very stressful for me :-)