If your bedfellows are frequent blanket hogs, here's a new product that might just help.
Essentially a giant binder clip, the Cover Clamp is quite... utilitarian in design, and probably something you don't want someone actually seeing on your bed. But, if you've woken up freezing on one too many occasions, desperate times may call for desperate measures. Sure, you could just sleep with two duvets on the bed like Europeans do, but here in the good ol' US of A, we like to complicate things.
It works by attaching said clamp to your covers, which is on a strap that's either looped around to your bed frame or tethered to a paddle that slides under your mattress. The strap has a "side release buckle" so you can "easily" get in and out without unclamping the whole shebang. Wondering how easy it is when you have to pee at 3 am.