Cotton pillows are naturally hypoallergenic and resist dust mites, mold and bacteria so you don't have to worry about unwanted reactions such as rashes, itchiness or breathing troubles. Cotton filled pillows enhance deep REM sleep because cotton removes moisture from your head and keeps you cool, often resulting in more peaceful rest with less turning and tossing.

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Synthetic pillow fills that contain flame-retardant chemicals, such as polyurethane, even though the flame-retardant characteristics are a positive attribute, polyurethane pillow fill emits Polybrominated Diphenyl Ethers.  PBDE's are hormone disruptors and can negatively affect an unborn baby's placenta and contaminate a mother’s breast milk, according to medical doctor and TV personality Josh Axe at DrAxe.com.