I sit on my reclining sofa or lay on my bed all the time for power sessions with my macbook, Xbox, and PSVita. Its killing my back. My spine is getting a perma arch and the muscles are getting tense one way and too loose in another. I dont even sit up straight any more eating a meal. Its pretty bad. What do you sit on for power sessions? Is there any better chair I can sit on to have sustainable posture? Certainly having a screen above my shoulders and not on my knees would help.