Anecdotally I can say it has a large effect on the male brain too. The lack of sleep and time changes you. You get ruthless against time stealers and start seeing 6 hours as a nice long sleep. Full disclosure : I've had about 8hr sleep in 3 days,two sick kids...
That is irrelevant as it is consequence of life style change. Many mothers do not change lifestyle. This however makes me think how much of the woman change is due to the life style change which is mandatory in given situation for majority of mothers and how much is programmed.
I'm not sure what you mean. Babies necessitate a change of lifestyle if only because they demand to be fed in the middle of the night.