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The Truth About Cortisol and Sleep Training: What Every Parent Needs to Know (Updated for 2026)

The Truth About Cortisol and Sleep Training: What Every Parent Needs to Know (Updated for 2026)

If you’ve spent any time on social media or Googling sleep training at 2 a.m., chances are you’ve come across a scary claim like this:

“Sleep training raises cortisol levels and damages your baby’s brain.”

As a mom, that sentence alone is enough to make your stomach drop.

You want your baby to sleep — but not at the expense of their emotional health, attachment, or development. And the truth is, most parents are trying to make the most loving decision possible with very little sleep and a LOT of conflicting information.