The catch is that, in real life you enjoy eating and sleeping because it makes you feel really good, even though sleeping, eating and cooking are all time consuming and takes a lot of work.. Unfortunately, we cannot simulate that kind of pleasure you get from sleep and food in a game. So without that kind of pleasure and survival elements are added to a game, it becomes an annoying chore.
So how do we make sleeping more appealing to the player? maybe:
1. regenerate health through sleeping but not waiting.
2. create a fatigue bar (not stamina), and it slowly drains over time, say maybe three days, and when you are low on fatigue your running speed will slow down, your attack speed also slows down, your stamina and magika are damaged, but no more than that. when you are out of fatigue you pass out for several hours (passing out only gives you a little bit fatigue back so you still have to sleep), and the only way to restore fatigue is to sleep.
3. race's special powers can only be restored through sleeping (after one day of time constraint has passed, that is)
4. oh yea and healing disease not only requires a potion but also sleep.
5. By Alexandus: sleeping for long enough should give the player a well rested buff