I am unusual sleeper in that I rarely move any part of my body while sleeping and dream 100% of the time even if just nodding of for a few moments. Could safely sleep without restraints on a cliff ledge. As a long time outdoor backpacker, do use a foam pad. Due to my low weight 135#, can sleep in a range of awkward positions, though as a light sleeper easily awoken by unusual sounds, don't always fall asleep easily if not during habituated circadian rhythm periods. At my residence, I most often sleep at either a living room couch or my upstair's queen sized floor mattress.