I couldn't afford a whole new bed system. But I bought a tempurpedic mattress pad and then covered it with a high-end featherbed from Overstocks dot com. The combination is great. It's made a huge difference in night spasms and general comfort. I really recommend this if you can't get a whole new system.

I have the same approach with my pillow. I have a tempurpedic pillow and a thin, but very nice, down pillow over it for comfort and heat absorption. I absolutely love them.