Disclaimer: Naruto isn't mine
Being a dad means accepting the fact that your wife will probably go into labor late at night at least three time. This is just a preview of what children do to their parents' sleep.
Sasuke had learned that anytime Naruto went into labor at night. It was false. It was false because the baby in Naruto's stomach was a bitch/bastard. Sasuke only felt a tiny bit guilt saying that. Most of the guilt would come after the baby was born.
First Naruto would go into labor somewhere around elven. He would tell Sasuke to wake up and take him to the hospital. Fifteen minutes later he would announce that it was false and they could go back to bed.
Then around midnight the event would repeat itself going on until one-twenty eight when Naruto finally declared that the labor was false, that Sasuke could rest easy.
Until Naruto started going into false labor, four times a night.