Six.
You will apparently sleep, uninterrupted, again when your kid is 6 years old.
This study in the journal "Sleep" found that the first three months are the hardest, with the most disruptions, which makes sense.
But the almost 5,000 parents surveyed said they still weren't sleeping when their kids started kindergarten, typically at the age of 5.
Researchers say the increased responsibilities of parenthood contributed to sleepless nights long after the feeding and diapering days.
And apparently women lost more sleep than men, losing about 41 minutes of sleep compared to dad's 14 minutes.