Can electric mattress pads be used over sleep number bed?

Yes! According to the select comfort sleep number FAQ: Heated mattress pads and electric blankets can both be used with your SLEEP NUMBER® bed. Please note that the use of a heated product with the mattress will cause your SLEEP NUMBER® setting to vary. These variations are completely normal and it does not mean your mattress is losing or gaining air. Rather, it reflects the varied pressure in the air chamber due to the temperature difference.