We have a memory foam (Tempur) mattress and were advised not to use an electric blanket with it. i think because they rely partly on body heat for their excellent support. Therefore I've returned to a hottie. It has it's own fleecy cover and stays warm all night.
Farage fails to report 5 million gift!
Changing from a Manual car to an Automatic after driving manual for around 50 yrs

petallus - they are nice on a cold morning as well as when you go to bed.