Looking over the rules for SLEEP, it does not seem to include REST. This feels intentional, but I'm not sure. Every other games just assumes that you would be resting while sleeping and that will be good enough to get back whatever stats, spells, powers, etc. that the game allows, so I figure it's worth double checking.
Assuming this is intentional, it will dramatically effect how quickly characters are able to get back lost ability points. It also means that players will have a lot more decision points about who's going to MAKE CAMP and KEEP WATCH when the characters who are best at those things really need to REST.