Pillows also frequently contribute to allergies that impair breathing. The source of allergens can be the filling (down allergies are common) or dust mites. I highly recommend getting a nonallergenic foam pillow and a dust-mite-blocking protector. You should toss your pillow into the dryer every few months to kill dust mites and replace it every couple of years.
If you're in the market for a mattress, Consumer Reports found that people who spent 15 minutes testing a bed in the store—spending at least five minutes on each side, especially in their preferred sleeping position—were as satisfied as those who were allowed to take the beds home for a test sleep.