Brain Age and Sleep Architecture in Meditators

This is a single-center, cross-sectional study that will recruit approximately fifty seven (57) meditators and fifty one (51) controls. Individuals that have learned at least the Shambhavi Mahamudra Kriya practice and live in Massachusetts will be mailed a DREEM EEG device, and a sleepimage ring. Participants will be asked to wear the two devices while sleeping for three consecutive weekday nights (Sunday night to Thursday night) and two weekend nights (Friday and Saturday nights). While meditating during the day, participants will only wear the DREEM EEG headband. Participants will also undergo neurocognitive tests from the NIH toolbox during one virtual visit via video call. Meditators who join the study will be asked to invite a control subject to the study, matched for age and comorbidities.

Inclusion Criteria (Meditators): 1. Previous experience with learning Shambhavi Mahamudra Kriya 2. Age 18 years or older. 3. Lives in the United States barring California Inclusion Criteria (Controls): 1. Age 18 years or older 2. Lives in the United States barring California Exclusion Criteria (both groups): 1. Non-English Speaking 2. Night Shift workers