The 34-year-old admits 'some nights are longer than others' but has found a trick that usually gets North, one, off to bed.
KIM AND KHLOE KARDASHIAN HAVEN'T SPOKEN FOR SIX WEEKS: 'THEY'RE PROBLEMS AREN'T FIXABLE'
She told a UK magazine: "[I give her] a bottle at night with some cereal in it.
"I put in the milk, and then the rice cereal, and then you have to cut the nipple a little bit more to let it pass through, and it fills North's tummy and she'll pass out."
Kim also revealed that her husband Kanye, 36, has his own method of getting their little girl to sleep.
KYLIE JENNER SPARKS 'BOOB JOB' RUMOURS WITH REVEALING NEW SELFIE
She said: "The best is when Kanye's recording in the home and we're in Mexico or wherever, and the music will be upstairs and she'll hear it, and it's really loud and you'd think it would disturb her, but I kind of rock her to it, and she'll just pass out [too]."
The reality TV superstar said her husband likes to come up with extravagant, out of reach ideas and make them happen.
KHLOE KARDASHIAN'S 'REAL FATHER IS LIONEL RICHIE': STRIKING RESEMBLANCE TO SOFIA RICHIE
Of their wedding earlier this year, she said: "He was like, 'we are going to go to Versailles, and we should have our wedding at the Louvre,' and I was like, 'What?'
"There's obviously music restraints and constrictions at a lot of places like the Louvre. And then maybe four weeks before the wedding, I thought we were set and done and he said, 'Let's move it to Florence,' and I was like, 'What?' And he was like, 'And let's not tell anyone so that we can surprise everyone the night before and have everyone go to Paris and then we'll fly everyone to Florence."