I love this trick. The best is putting it in your setup 5 minutes or so before you get in. Makes for getting in a warm bed.
Another thing that usually gets me is going to bed cold. I wait until I'm chilled to get in. It makes it harder and it takes longer to warm up for the night. The trick for me is get in bed before I'm chilled.
Is that too much to ask? Girls with frikkin' lasers on their heads?
The hanger formly known as "hammock engineer".