[necovek]

The way my wife and I had it with my first was for me to start taking care of my boy at 6am when he wakes up and let her sleep until 9am every morning, when I'd start work (from home). If you can find a time where the boy does not need her (eg. those times when he's fussy but not hungry), that's the best you can do.

Sometimes that's not an option, but this worked great with our first (we couldn't do it with our second, so my wife is more of a zombie this time even though the daughter is a better sleeper on average).

[gambiting]

I do exactly that - she leaves him with me 6-7am and then I look after him until I have to start working around 9pm. And while yes, it provides her with some much needed sleep, it's still nothing in the grand scheme of things. I think as a human you really need that uninterrupted 6h+ of sleep at least every now and then, and not having it for months at the time just absolutely wrecks you as a person.