Why does my baby still seem overtired even after a good nap or night of sleep

The reason why your baby might still seem overtired after a good night's sleep is something I’ve learned through years of experience: sleep is cumulative. I’d like to share a real-life recent example involving a baby I’ve been watching.

Before we dive in, I want to clarify that it is never my intention to judge parents. I am a specialist, and you don’t need to be. I often notice subtle cues that parents might miss, but this is certainly not a reason for them, or you, to feel bad. This is my life's work, while parents have their own careers and daily lives to manage.

Baby Liam: A Case Study

You might remember Liam, a baby I’ve posted about before. From a very young age, Liam has always been sensitive to change. He’s a bit "suspicious" and prefers to be in control to feel safe. Because of this, any adjustment I make with him must be introduced gradually.

Liam is 19 months old now and takes one afternoon nap, typically from 12:00 to 2:00 PM. Because of my experience, I know how to make nap time feel safe for him: I move slowly, respect his right to be upset about stopping his playtime, and allow him the time he needs to settle. With me, he consistently takes a sharp two-hour nap. With his parents and grandparents, however, the duration often depends on how much resistance he puts up at bedtime.

Last week, Liam’s parents had some work done in their house, which caused his naps to shorten to about 90 minutes. Because he is sensitive, environmental changes affect him deeply—not to mention the noise, which woke him up a few times. Even though he seemed happy during the day, he began having meltdowns at bedtime, showing clear signs of being overtired, or in a "wired-but-tired" state.

I knew he was due for a long, restorative nap. Usually, when his schedule is thrown off by vacations or family events, I am able to "reset" him by letting him sleep as much as he wants (usually three hours) until he recovers. But because the construction work continued, he couldn't take that long, restorative nap and carried that "sleep debt" throughout the entire week.

Resetting an Overtired Baby’s Schedule

When I got to work on Monday, Liam seemed normal and had his breakfast as usual. We went to the zoo and had plenty of outside time, but as soon as I mentioned it was time for a nap, the meltdown started. I knew he was still carrying that sleep debt from the previous week. Since the construction was finished, this was the perfect day to reset his schedule in a quiet, predictable environment.

I used my techniques to wind him down, and I knew this was the day he would finally take that three-hour nap and return to his normal self—which is exactly what happened.

To Liam’s parents, he seemed fine. He was taking his naps (between 90 minutes and two hours) and sleeping well at night. The only subtle difference was that I knew he typically sleeps for two hours sharp when he is well-rested, and he was sleeping slightly less than that. Additionally, the pre-nap meltdowns were not normal for him.

How did I learn this, and why shouldn't you feel bad?

I have worked with dozens of babies, and because I have an analytical mind and a Master’s degree in Data Science, I am able to see and analyze patterns. I’ve had the chance to test my tools and techniques with many different children until I found what works best. Liam’s parents have their first baby; it would be impossible to expect them to know everything instinctively. That is exactly why they hired me to help.

If you are a first-time parent, or even if you have been a parent for a while, please be gentle with yourself. Remember, I am a specialist who has trained with several babies plus extensive education, whereas you are practicing with your own children and do not have the specialized education I’ve been obtaining for years.

All of this knowledge can make your life easier and help your baby achieve higher-quality sleep, but it doesn't mean your baby will be harmed if things aren't perfect. You are doing an amazing job, and the fact that you are here seeking knowledge to improve is already huge.

If you would like to learn more about infant sleep, behavior and emotional development, stay tuned for the launch of my complete course for parents.