Sudden Infant Death Syndrome and Sleep
difficulty breathing due to an infection, decreased oxygen intake resulting from bedding that covers the infants face. For instance, infants who are sleeping on their stomachs and begin re-breathing air that is trapped in their bedding normally wake up and cry. An infant with a brain abnormality may not send the protective wake up signal. Similarly, an infant sleeping on his or her stomach whose head becomes covered by bedding may begin to overheat; while the brain usually triggers the infant to wake up and move to free his or her head, the overheating may inhibit the brains protective wake up signal.
To help explain the complex processes that may cause SIDS, The National Institute of Child Health & Human Development (NICHD) has put forward the "triple-risk hypothesis," suggesting infants who die of SIDS are:
A seasonal component has also been noted in SIDS, as SIDS deaths tend occur more frequently during the winter months. This may be linked to using excess clothing and bedding in an attempt to keep infants warm, and to the increase in respiratory infections that occur during the winter.