I had to change my mattress 3 times because all of their mattress are not fit for purpose. The materials they use to make the mattress are non breathable so the mattress becomes extremely hot with your body temperature, so it's like sleeping on a sweaty sauna. DREAMS offer this 100 nights warranty to allow customers to change their mattress within 3 months. Every time I have changed the mattress I upgraded to a more expensive one plus paid £50 for the exchange but all of them have some issues. Either too firm like sleeping on the floor, either too unhealthy hot... I feel I wasted my time and money because none of their mattress are good quality. I regret having gone there!