Most people have trouble sleeping on a regular mattress.
Often, they have to stack up pillows and blankets to put themselves in their most comfortable sleeping position. The only way I can get comfortable is to fill twenty Ziploc bags with warm water and stick them inside my pajamas. Then I crawl under my mattress and scream until I pass out. I've slept like this for twenty years, and it ain't gonna stop now. But then I found this site, a site where I could buy an adjustable bed, mattress, waterbed, airbed, or lift chair.