airflow through a piece of furniture , such as a ventilated mattress of an infant sleep system , is conditioned . when applied to an infant sleep mattress , the conditioning improves the infant &# 39 ; s sleep environment to promote the infant &# 39 ; s health and / or enhance sleep . the conditioning can include the distribution of beneficial gases , vapor , heat , or other conditioning elements into the airflow . the conditioning can also include filtration of the airflow .