I haven't thought of using a sleeping mask but when I saw Dr. Sheth's Haldi & hyaluronic acid sleeping mask I thought to give it a try, and I loved the product. I either apply it directly on my face after a facewash or apply it after a serum. The only thing I seem not to like is it's a bit expensive to the amount of product being provided. Either you can increase the amount of product or reduce the price would let a lot of people to buy more and more. leaving that everything about this product is good.