wordsalad

My sister is moving in with me and i need to combine my workspace and bedroom as a result. The bedroom door comes off the livingroom, from inside the room it is on the West wall and is directly across from the front door, also on the West wall. The bedroom door is on the farthest North portion of the wall. It also opens toward the South (in other words, rather than hitting the North wall, it rests against the West wall when fully opened.) The room is square, the North wall is taken up with two doors leading to the closet and the bathroom. The old East wall used to have a porch outside, however, the porch has been converted into part of the room. The problem lies in that the porch portion has a lower ceiling. There is a low/large window on this new East wall that is directly across from the bedroom door. There is also a small high window (you can look out of it while standing) on the South wall of this "porch portion". These are the only two windows in the room. This portion of the room also sort of juts out from the squarenss of the house as a whole. I was thinking, to promote a separation of "work" and "sleep", of creating two separate areas, using the already occurring ceiling height difference as a guide. My question is, should I utilize this "former porch" as the sleeping area? or should I utilize it as the study area? I know there are issues surrounding windows and beds, would the fact that the south window is high remedy this any? also, what is your advice about putting beds against walls on two sides? Thanks for any advice, Kristen