Well, he'd most definitely sleep in at least light armor. Maybe a Mithril Breastplate or so. He'd most likely have Ring of Mental Fortitude or another source of Mindblank, along with something to block the "first negative effect on him", e.g. Scarab of Invulnerability [MiC] and Shield of Time Buttress [MiC]. He could sleep with such an animated shield protecting him all the time for all it counts. And he most likely has a Luckblade [DMG] to reroll his saves along with the Luck-bonus and Belt of Battle.

Do you mean "level 24 Warrior" or "level 24 Fighter" though? 'cause I mean, how does one know their class levels? Martial types benefit greatly of multiclassing. And epic martial types are so ****ed they need all the help they can get.