Mid-March is not usually a busy time for mattress deals. But today marks the start of National Sleep Week, which means that the best mattress manufacturers are offering killer deals on our favorite mattresses. [For example, Japanese mattress maker Airwave is offering a $100 discount on all mattresses with the coupon code "QUALITYSLEEP." This is one of Airwave's best sales. After the discount, the Airwave Mattress Advance starts at $1,178.

Unlike traditional mattresses, the Airwave Mattress uses a proprietary technology called Airfiber, which distributes weight evenly and allows airflow for a deeper, more restful sleep. The mattresses are also environmentally friendly. The company's Airfiber material is made of food-grade polyethylene (LLDPE), an environmentally friendly material that can be melted down and reused many times.

The new Airwave mattress is 8 inches thick and softer than its predecessor, the original Airwave mattress. The new mattresses come with three airfibers, including a pillow top layer and two covers. All Airwave mattresses also come with a 100-night trial.

For more Sleep Week deals, see Bedding Sale Deals.