I was shocked to discover today that Endurance doesn’t do this:
Benefit: […] you may sleep in light or medium armor without becoming fatigued.
Normal: A character without this feat who sleeps in medium or heavier armor is automatically fatigued the next day.
(Nevermind the fact that light armor doesn’t fatigue anyone...)
So is there a feat for this? It has to be specifically a feat for my purposes; I know a restful crystal can do it, and I’m sure there are others, but a feat is what I’m looking for.
I am also looking specifically for a feat that says “you may sleep in heavy armor without becoming fatigued.” Things that effectively cause that to happen one way or the other are not what I’m interested in. So, for example, if there was a feat that caused heavy armor to be treated as medium armor, which combined with Endurance allows you to sleep in the formerly-heavy armor without getting fatigued, that would not be an answer to this question. Nor would a feat that allows you to not sleep, or makes you immune to fatigue. Just looking for a feat with this specific benefit. (The feat may certainly have other benefits as well, but this one has to be an explicit benefit written into the feat.)
Any WotC-published 3.5e material, or Dragon or Dungeon 3.5e material, including 3.5e-legal 3.0e material, is valid for this question.