My Mattress Hangs Over My Base

Applies To: Traditional Sleep Number Mattresses. 

It’s important to know that because Sleep Number® beds are made primarily of fabric and foam we expect to see a little curvature along the edges and a small amount of bowing doesn’t necessarily mean that your cover needs to be replaced.  Please follow this guide to check if your mattress cover is stretched.


Before You Begin

Remove all bedding from your mattress and set both sides of your bed to 100 while not in the bed.


Measure the Mattress Cover

Take three measurements of the width (side to side) of your mattress: one at the head, on at the middle, and one at the foot.  Please make sure these measurements are taken from the widest point of the head, foot, and center of the mattress.  You may want to have a second person assist you in order to get the most accurate reading possible.


For FlexFit™ Adjustable Base Owners

Please Note: If you own a FlexFit™ adjustable base, it will always be about one inch narrower than your mattress so it can fit into a standard bed frame.  If you notice that your mattress is hanging over the side by more than one inch, or if your mattress is sliding on your base, please check the Mattress Sliding on Base guide.


Contact us with the results of your troubleshooting for further assistance.


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