Wow, didn't think that they could crawl right in and disappear. Very cute. :) Looks so funny to see the sack wiggling around on it's 'own'.
lol, I know, I often check on them and just see some sacks bopping about. I was surprised that they went right into them like that too. I have to fluff them back up again each morning though, as they get trampled overnight. A piggy steps out for a minute and someone else comes and squishes her bed! :P
Ah, how cute!