My bedroom's kinda on the small side, so my only options are a full-size bed, which is too short lengthwise but plenty wide enough because I tend to roll around a lot while sleeping or trying to fall asleep, or an extended twin, which gives me an extra foot of room, which I could really use, but is too narrow for me because I toss and turn. Though I suppose that narrower bed is the price I'd have to pay to keep from hitting my head on the head of my bed almost every night now, until I have a room where I can fit a queen or king size mattress. D;
Actually, now that I think about it, I could fit a queen size bed in here, but that'd be the only piece of furniture in my room. XD;