She says the "full madness" takes quite the toll, giving an example ... "I always have to do one of my daughter's hair — and it has to be perfect and it has to be a certain way — and then this one needs me to put his shoes on and they all need you ... It's like full crazy madness, cooking, running around. Like, it's wild."

Kim says it's still a rewarding process, but says, "There are nights I cry myself to sleep. Like, holy s***, this f***ing tornado in my house. Like, what just happened?"

As you know, Kim and Ye have 4 little ones together -- North, Chicago, Saint, and Psalm. It's unclear if Kanye's feeling the same pressure ... fact is, Kim has the kids most of the time.

For what it's worth, Kanye and Kim have been spotted co-parenting from time to time -- including earlier this month at Saint's soccer game ... so it at least looks like she's got some support, at the very least.