It’s completely up to you. Many sleepers will swap their existing duvet with the Weighted Blanket whereas other sleepers will use both a duvet and weighted blanket on the same bed. For sleepers who strive for deeper and longer sleep, using the Weighted Blanket is so beneficial that the blanket is always on the bed, either to replace or be used in conjunction with a duvet or quilt. To increase its many uses, the Weighted Blanket uses a smart, versatile design that can be secured inside a duvet cover yet looks equally attractive when uncovered.