The mattress (shaped like an isosceles triangle with the top chopped off) allows for leg movement, stretching out and curling up. Since the body approaches the edge at an angle, it also affords a bit of warning before the occupant rolls off.
While taking up the same amount of floorspace as regular singles when arranged in a line (alternating head and foot directions) as in a hospital ward or dormitory, ITB's generously provides the legroom of doubles or better.-- FlyingToaster, Apr 19 2012 http://en.wikipedia.org/wiki/Procrustes [not_morrison_rm, Apr 21 2012] Simple, and genius.-- zen_tom, Apr 19 2012 Where does the trapeze fit in?..and who is this Isoscele person?-- 2 fries shy of a happy meal, Apr 19 2012 (Annoyingly over-pedantic) Baked - all conventional beds are already isosceles trapezoids.-- spidermother, Apr 19 2012 Excellent idea - particularly the conversion of a single to a double bed.You'll need a footnote to silence the pedants: "Ignoring the special case of rectangular isosceles trapezoid".-- hippo, Apr 20 2012 I have the perfect sheets for this bed (these beds)! Unfortunately, the margin is too small for me to describe them here.-- 4whom, Apr 20 2012 Some beds might be parallelograms.-- RayfordSteele, Apr 20 2012 Does this come with a Procrustes (TM) bed attachment?-- not_morrison_rm, Apr 21 2012 Very good, 4whom. Shit, no square brackets on Android keyboard.-- UnaBubba, Apr 21 2012 Actually it'd work just as well on doubles; though the effect wouldn't be near as pronounced, they'd give a bit more room for expansive night tables at the head.
//Baked - all conventional beds are already isosceles trapezoids.// Stand still a sec, I think I've got an isosceles trapezoidal 2x4 around here somewhere.-- FlyingToaster, Apr 21 2012 Admiral Ackbar is pleased...-- 4whom, Apr 21 2012 If it were a right-angle trapezoid, it would fit better against one wall.-- RayfordSteele, Apr 21 2012 random, halfbakery