It really works! Try it! When it's too hot under the covers, but too cold to uncover, just stick a foot out from under the covers, and you'll be a lot more comfortable.

I just wrote about it in a thread asking for life lessons, and I offered this, and it sparked a huge discussion, with a lot of up votes.

For the record, those against the idea weren't so much worried about a cold foot, they were far more concerned about attacks by monsters, and the occasional cat.