Cortisol and Sleep Training: What You Need to Know
/Cortisol, often called the "stress hormone," is essential for regulating our sleep-wake cycles, metabolism, and immune system. Its levels naturally rise in the morning to promote wakefulness and drop in the evening to encourage sleep.
During crying episodes—such as those that may occur during sleep training—babies can experience temporary increases in cortisol. This is a normal, short-term response that helps the body handle stress. However, many parents worry that this increase could lead to long-term harm. Let’s break down what the research says.
Does Sleep Training Lead to Harmful Cortisol Levels?
Crying is a baby’s way of communicating, and some crying is expected during sleep training as they adapt to new routines. Temporary increases in cortisol are part of this process, but studies show they don’t result in long-term stress.
A study in Pediatrics found no significant differences in cortisol levels between sleep-trained babies and those who weren’t, both shortly after training and up to five years later. This suggests sleep training has no lasting impact on stress regulation. Read more here
Another study highlighted by the BBC noted that while methods like controlled crying can temporarily raise cortisol levels, these normalize as babies adjust to their new sleep habits. Importantly, no evidence was found linking sleep training to long-term emotional or behavioral harm. Read more here
Why Healthy Sleep Matters
Consistent sleep is critical for a baby’s overall health and development. Chronic sleep deprivation can disrupt cortisol regulation, leading to mood changes and health issues for both babies and parents. By learning to fall asleep independently, babies often enjoy better, more restful sleep—which supports healthy development and stress regulation.
Research in the Journal of Pediatrics found that sleep training methods not only improved sleep quality but also had no negative effects on parent-child relationships or child development—even years later. Read more here
Balancing Compassion and Consistency
For parents concerned about sleep training, it's essential to choose an approach that combines compassion with consistency. Methods such as "camping out," where a parent stays in the room during sleep training, can provide reassurance to both parent and child. This gradual approach allows the child to develop independent sleep skills while maintaining a sense of security.
Remember, temporary cortisol spikes are a natural part of the adjustment process during sleep training. The long-term benefits—better sleep for your baby and your family—far outweigh the initial challenges.
Need Help Creating a Plan?
If you’re ready to help your baby develop solid sleep habits, I can help! With experience supporting over 900 families, I can guide you through creating a personalized sleep plan that works for your baby and your family. Sleep is one of the most valuable investments in your child’s well-being!
