Which side of the pillow do I sleep on? Customer Service Desk August 06, 2019 14:32 Follow The pillow should be placed “cap down” against your mattress. Related articles Is normal tap water okay to use in the pillow? How long can the water stay in my pillow before it needs to be changed? My pillow leaking, what do I do now? Can the pillow be washed? What is the size of the Chiroflow® Professional Waterbase® pillow? Comments 0 comments Article is closed for comments.