Beds with storage under matress can have hydraulic parts (sorry, don't know how they're called exactly) to help lift the matress. Example: https://www.ikea.com

Beds with storage under matress can have hydraulic parts (sorry, don't know how they're called exactly) to help lift the matress. Example: https://www.ikea.com/pl/pl/catalog/products/80404078/ https://www.ikea.com/pl/pl/catalog/products/80404078/