From overhead, two dangling cords attach to the blanket (along the lengthwise midline, 18" in from head and foot of the cover).
When the cords are pulled (using a handcrank installed within reach on the wall above the headboard) the blanket turns into a nifty pup tent.
When slightly slackened, the blanket, laying on top of the bed, can be arranged for comfort, but can't be pulled completely to one side or the other.-- FlyingToaster, Jan 16 2015 Space Blanket http://en.wikipedia.../wiki/Space_blanketThin, lightweight, effective; maybe every household should have a dozen or two of 'em. [Vernon, Jan 17 2015] Not very useful if it gets you sent to sleep on the couch …-- 8th of 7, Jan 16 2015 Yes, this could be useful on those cold nights when my wife accuses me of "pushing all the blankets over to her side." I wish i was joking.-- AusCan531, Jan 16 2015 You can still regulate your own side, just can't deregulate the other.-- FlyingToaster, Jan 17 2015 The Equilt. For maximum comforter conformance.-- 2 fries shy of a happy meal, Jan 17 2015 If the cloth had nap (geddit?) which aimed to the centre, then micro movements would cause it to gradually creep into a pile in the centre of the bed. Wouldn't completely help, but at least the hogger would have some kind of corrective action against them.-- Ling, Jan 17 2015 Well, the opposite of the post: a tube blanket, encircling the bed or occupants, would accomplish much the same thing, but would disallow the option of sleeping with only a small amount of blanket, and would complicate getting up in the middle of the night, or in the morning.-- FlyingToaster, Jan 18 2015 Not if the "tube" blanket was in fact a Möbius strip, allowing the sleeper to sleep on both the inside and the outside of the blanket simultaneously.-- 8th of 7, Jan 18 2015 Ideally sized for leaving on sunbeds, no doubt, as well as other areas they wish to claim ownership of, like Alsace-Lorraine, the Sudetenland, Poland, Belgium, france, Denmark, Holland …-- 8th of 7, Jan 19 2015 random, halfbakery