List of causes of Ondine's curse. Following is a list of causes or underlying conditions (see also Misdiagnosis of underlying causes of Ondine's curse) that could possibly cause Ondine's curse includes: Persons who have CCHS get it at birth, or develop it due to severe neurological trauma/damage to the brainstem.
In real life, Della (Barbara Hale) was married and Perry (Raymond Burr) was gay. So, no, they were not an item on the show or behind the scenes.
Perry is an alcoholic beverage made from fermented pears, similar to the way cider is made from apples. It has been common for centuries in England, particularly in the Three Counties (Gloucestershire, Herefordshire and Worcestershire); it is also made in parts of South Wales and France, especially Normandy and Anjou.