I've seen people talk about Necessities of Morrowind and Morrowind Comes Alive as "best of" examples of realism mods out there. I have played both, and neither one interests me.
However, I would like to find out if there is a mod that addresses only the issues of char's sleep and fatigue. I definitely think that the char should experience some physical, maybe mental consequences if he/she does not sleep after some (arbitrary based on race, maybe) time. It's always struck me as unrealistic that I could enter a cave, wander around for days and never feel the need to sleep. Indeed, as a pleyer, I frequently lose track of time for my char exploring an area. Potions and spells should only be able to carry the day for so far and then become ineffective.
So is there a mod that focuses only on this aspect of the game, and does it have any special requirements? I want something that has as little impact on FPS as possible. TIA.