Back in the 80's my live in girlfriend had a water bed. It was a new experience to me. The heater was on a timer and adjustable. I use to compete in body building on a National level and a week before a show I would crank up the heater in the bed and it would turn into a sauna which would cause me to sweat out the remaining water under the skin and I would wake up looking way more vascular.

I also remember having to adjust to the waves and the rolls of the beds movements. Oh what memories.