Eileen McGill, sleep concierge at New York City's exclusive Benjamin Hotel, says the first thing to consider is the position you sleep in.
Side sleepers should choose a firm pillow to help keep the neck and spine properly aligned.
Back sleepers should pick a medium-density pillow because it cradles the head and supports the neck.
Stomach sleepers need a soft pillow to avoid stress on the neck and spine.
You don't need to spend a fortune to get a good pillow. Koeppen tested three pillows bought by a producer for The Early Show. She preferred the $40 pillow over the $15 and $100 ones.
Prevention magazine tested the therapeutic claims on 40 pillows: only nine really lived up to their claims. Click here to see the best pillows.