After a week or so of adjusting to the new added weight, it helps me sleep very well; without dreaming or waking often. I used the recommended 10% of your weight, and at first I was worried that it was too heavy for me. The first week I had trouble sleeping because the weight made me feel like I was being smothered, and made my heart race and breathing harder to do. After getting used to it, and discovering I shouldn't put it over me higher than mid-chest, it works wonderfully for me. It is a very good quality and thick material and I washed it in the machine and dried on low and it was fine. I also like the bag in comes in a lot; good for traveling between places. My one note is that I would have liked the option of a 41"x60" in 12lbs, as this current one is a tiny bit large for my bed. It arrived on time.