Broadband Sound and Sleep

Inclusion Criteria: * Adult subjects between 21-50 years old * Free of psychological/psychiatric conditions that preclude participation. * BMI between 18.5 and 35. * Self-reported regular sleep schedule; able to maintain their sleep schedule during the course of the study. * Self-reported sleep duration of 6-8.5 h per night (verified by ambulatory sleep monitoring with wrist actigraphy and daily logs). * Ability to read/write English. * Fully vaccinated for or recovered from coronavirus (COVID-19). Exclusion Criteria: * Subjects habitually use broadband noise (e.g. white noise machines) to promote sleep at home. * Hearing loss greater than 25 dB in any frequency band up to 8 kilohertz (kHz). * History of neurological, psychiatric, or other medical condition that excludes participation. * Current mania or psychosis. * Current depression as determined by the Beck Depression Inventory with a score of 17 or greater (Beck, 1996). * Alcohol or drug abuse in the past year based upon history and urine toxicology screen. * Excessive alcohol intake (above 21 drinks per week) or binge alcohol consumption (5 or more drinks per day). * Excessive caffeine consumption (above 650mg/day combining all caffeinated drinks regularly absorbed during the day). * Current smoker/tobacco user, or using nicotine replacement therapy. Those that have been nicotine-free for 30 days will be included. * Body Mass Index at or below 18.5 or at or above 35. * Acute, chronic, or debilitating medical conditio…