Baby insomnia is when your baby is awake in the middle of the night for 2-3 hours at a time. It is sometimes called a "split night" and usually lasts for weeks or months. This post will explain why baby insomnia happens and ways you can fix the problem based on my 10+ years as a sleep consultant. What Is Baby Insomnia or a Split Night? Insomnia is usually defined as the inability to sleep when you are actively trying to sleep. This could mean that it's hard to fall asleep, hard to stay