Yes I was checking up after posting, it has been referred to as a meditation chamber, but was actually a way for hime to take the life support system off.
What is he going to do in there though? Does he have a PlayStation set up?
I'd expect he needs to commune with the Force at times, no? Sure, he's fallen to the Dark Side and all, but it's still the Force that he draws his power from. I'd imagine there's a good amount of overlap with traditional Jedi practices.