It took 2 nights
I wasn't sure at first if I would be able to use the blanket. I kept overheating. Once I figured out how to not get too hot, I started sleeping deeper and longer. It has helped with my restlessness legs issue as well as sensation issues I have due to having fibromyalgia. The parts of me that can stay under the blanket all night are relaxed with no clinched muscles.
This blanket really helps with the muscle issues of fibro