Honestly, I’ve yet to have a great nights rest in a sleepsack. What little sleep I do normally get is down to the exhaustion of a heavy session prior to being sacked for the night. Not that my complaint inspires much sympathy out of most tops! And I have to say, there is something very pleasurable about waking up in bondage. The hazy feeling as your consciousness returns but the ability to move head and limbs being strangely vacant, is a VERY unique sensation. A moment of complete confusion and powerlessness.
You should definitely try it!