Many people change where they live or what they drive more often than they change their mattress or pillows. Yet nothing lasts forever.

Although there isn't much published research on mattresses, mattress quality may affect how sleep feels to the sleeper. Discomfort can make falling asleep more difficult and lead to restless slumber.

Does your mattress provide the support you like? Do you wake with your back aching? Is there enough room for you and your sleep partner? Do you sleep better, or worse, when you sleep away from home?

Mattresses may be made of inner springs, foam, fabric, water or air. They may be firmer or more responsive to your body. This, in turn, may affect body temperature and humidity, as well as comfort.

Don't know where to start on finding a mattress that will bring you better rest? Check out iVillage's guide to buying the best mattress.

Copyright 1999, National Sleep Foundation