Pebble Mattress Design - Extensive research conducted on mechanisms of SIDS (Sudden Infant Death Syndrome) shows it is likely to occur as the result from the re-breathing of carbon dioxide. This supported a mattress design which passively delivered maximum air circulation and ventilation at the mattress surface. During the product development process I studied advances the sleep, respiratory and ventilation research and industries which supported the development of not only Nook Sleep products but also many concepts for the adult sleep market.