Cjam, probably because you would have to reduce the fleet by half. Most pilots try to have some rest before signing on, but screaming toddlers, teenage kids who can only speak at the highest decibels possible, and all types of tin lids in between usually share the same house as you in my experience, to say nothing of the family dog, who has only one ambition in life that is to finally get the postman, and breaks out in mad barking patterns when ever the poor bloke is sighted. My trick was to leave early, and try to have a quick shuteye in the car, somewhere quiet, and that usually worked. But one thing became apparent when I retired, that the realisation that you were chronically tired, but did not know it, simply used to it.