During our trip to DC, our kids shared a bed. Our 6 and 2-year-old slept with heads at the headboard. Our 8-year-old slept with feet in our other kids' faces.
After a couple of days in the hotel room it was getting more difficult to still the kids' nervous energy, and one night it was nearly impossible to get them to go to sleep. But the finally began passing out.
As the wife and I lay in bed watching TV and being relatively quiet, we noticed our little two-year-old boy stirring a bit. Barely conscious, he moved his arm slightly out to his side. And began tickling his sleeping sister's feet.
Sleepwalker? No. Sleep eater? No. I've got a sleep tickler.