What we were taught in school was that most people like the sensation of the blanket so much that they will choose being warm over not having it. That's true for me and mine is made of a really warm fabric (minkee dots). I don't use it on my whole body when it is hot, usually just from my chest to above my knees.

The only time I haven't used it in the last 11 years is when I had ankle surgery and was afraid it would torque my ankle somehow. I remember how happy I was the day that I was able to use it again (it took 5-6 months).