We've recently been waking up each morning to a bed that looks like the result of a honeymoon evening: sheets all messed up, fitted sheets loosened, the quilt kicked across onto the floor. But although the libido may be high, these summer evenings are even higher, resulting in a lot of tossing and turning.
Bed, Bath and Beyond offers a few bed accessories designed to control bedding from moving to another zipcode as you slumber. First is the Sleep-Snug, a set of 4 plastic clips that hold your fitted sheet in place onto the mattress to create a snug and smooth finish for your bedding.
And for the comforted and duvet, Bed, Bath and Beyond sells these exclusive Duvet Grips, a simple push through design which can be used hidden inside the duvet to prevent the comforter from bunching up. Both are simple to install and each under $6 a pop online or at Bed, Bath and Beyond locations.
But what about your overheated noggin' during these trying summer nights? Blasting a fan or air conditioner all night is both expensive and sometimes detrimental to the health. How about a Chillow, a "thin, very soft, medical-grade, non-electric thermoregulating device"? Basically a pillow insert that can be used as-is or after cooled in the refrigerator for even more effective cooling effect. Looks like a promising item to help keep the tossing and turning reserved for romantic effect, and not because you're dreaming you've become a human crepe.

I have some of those duvet grip thingies (well, something similar) and they don't really work that well if you have a large comforter, say, queen size or larger. Sure, it keeps the corners of the comforter in the corners of the duvet, but the middle part still moves around a lot and leaves me with a bunch of bedding and no comforter.
I tried to use the Sleep-Snugs before but they don't work - well, not for me anyway. They were a bitch to get on and then kept falling off. Now I use large black metal binder clips to keep the fitted sheet tight. Sounds ridiculous but they work.
my duvet clips didn't work either so now i just use the smallest size binder clips to keep the corners of the comforter attached to the corners of the duvet cover.
i bought my brother a chillow for his birthday a few years ago and while he liked it, he said that the subakowa pillow worked just as well and was super comfortable.
Safety pins on the bottom corners of the duvet work really great and are super cheap.
For sheets tp stay on I use these stretchy clips that go under the mat and attach to the sheet- there are corner ones and ones that go underneath/accross the whole mattress. Both work really well but are slightly tricky to close.