Current Projects

RESET Study

We are trying to better understand how Cognitive Behavioral Therapy for Insomnia (CBT-I) improves sleep. This study specifically focuses on the role of cortisol, a hormone related to sleep and stress.

Currently recruiting for the RESET study!

Screener for RESET Study


Wake Up! US Healthcare Study

This project aims to enhance the literature and data surrounding sleep health training in the US. We hope to identify potential differences in sleep health training and competency acoss health disciplines, specifically comparing recent graduates of DO, MD, PhD, and PsyD programs.


Arash in front of a dry erase board showing the two-process model of sleep regulation

CBT-I and Depression Study

This project evaluates the effect of cognitive behavioral therapy for insomnia (CBT-I) on overall depression severity and assess whether the treatment effects of CBT-I on depression are related to changes in several different mechanisms (e.g., hypothalamic-pituitary-adrenal axis functioning, inflammation and behavioral activation.

Recruitment for this study is not currently ongoing.


Dr. Vargas holding PSG equipment in a sleep study space

CREST Study

Cortisol Rhythms and the Examination of Sleep Troubles Study. The study is being conducted to evaluate whether individuals with insomnia (compared to individuals without insomnia) exhibit differences in cortisol during the 24-hour day. You may participate in this research study if you have insomnia (persistent trouble sleeping at night) OR if you are a good sleeper (no difficulty falling or staying asleep).

Recruitment for this study has ended.