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High cortisol levels directly affect Melatonina levels, therefore your sleep cycle.
The following article says that 1 out of 8 people in America have issues on sleeping or falling asleep.

You can also find six tips to reduce your cortisol levels:
1. Make Effort to Grow Emotionally Happier. EFT Can Help
2. Make An Effort to Grow Spiritually
3. Make Some Simple Changes in the Way You Nurture Yourself
4. Make Changes in Your Diet
5. Add Some Special Supplements Called Adaptogens
6. Be Sure You Retain Lots of Minerals

https://bodyecology.com/articles/reduce_your_cortisol_levels.php