Every organ causes disease. The diaphragm is a vital pump just as important as the heart, yet little is known about it. So, the question is why (and how) did modern medicine miss this? Sadly, this is why the SIDS mystery was a mystery. I am qualified to state this based on over 15 years' experience as a ER doctor as well as holding a Pathology Master's degree and two years of SIDS research (with three co-authored, peer-reviewed articles published). Sudden unexpected respiratory arrest from acute diaphragm failure appears to be a cause of SIDS. It is precipitated by a ventilatory workload surge on a critically fatigued diaphragm, typically from a roll to prone sleeping position or REM sleep onset (CNS inhibition of accessory respiratory muscles).