Yes, you can. Normally grounding sheets are compatible with the most popular mattress sizes, which means they can be used with various types of bedding. However, manufacturers generally recommend fitting the grounding sheet directly on the mattress for optimal conductivity. Yes, you can. Normally grounding sheets are compatible with the most popular mattress sizes, which means they can be used with various types of bedding. However, manufacturers generally recommend fitting the grounding sheet directly on the mattress for optimal conductivity.