Co-sleeping and SIDSIs co-sleeping a Co-sleeping means increased risk of SIDS.cause of SIDS? “Overlaying” blamed in past. How is unknown. Hypoxia due to rebreathing parents’ air, airway obstruction, and thermal stress. Temperature is higher. Prone position also a cause. Proves temperature as direct cause. What is “overlaying?” Why does the prone position cause a higher temp.?Summary:The exact cause of how co-sleeping causes SIDS in unknown; however, it could beattributed to many things such as an increase in temperature or hypoxia.