Currently on the left, but usually the right. We swapped sides at the start of the summer because DH broke his left leg, so if he stayed sleeping on the left of the bed his broken leg would have been in the middle of the bed. He needed it propped up on pillows so it was easier to swap places so we didn't have a mass of pillows in the middle, right in the way of everything. His leg has been better for months now, but we've just not got around to swapping back for some reason! Should really as it's nearer the door so I can get to the loo easier!