I tend to sleep on my side - though I do tend to roll around a bit and change sides. Now I'm curious if it would still work well only using two of the tethers and loosening them up a bit to allow movement. He's been in the process of adding ankle cuffs (with a short chain) at least some nights, but has eased up the past few nights due to me having a killer migraine. I'll have to report it to my Master to see what he thinks.