Glasses
Conditions
Brief summary
The Phone Sleep Study is being done to find out whether wearing blue light-blocking glasses in the evening improves subsequent sleep. This is a 21-day study and participants will be asked to wear a sleep-monitoring actiwatch, a heart tracker, and an activity monitor, as well as to provide screenshots of participants' smartphone's screen time app for three weeks. Participants will also be asked to wear a blood pressure cuff on their arm for three days during each week, for a total of nine days.
Interventions
DEVICEBlue light-blocking glasses
Participants will be randomly assigned to wear either blue light-blocking glasses or glasses with clear lenses during the second week of the study. During the third week, participants will be assigned to wear the opposite pair of glasses.
DEVICEGlasses with clear lenses
Non-blue light-blocking glasses
Sponsors
Penn State University
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
OTHER
Masking
SINGLE (Subject)
Masking description
Participants will be told that both pairs of glasses block blue light.
Intervention model description
Participants will be randomly assigned to wear either blue light-blocking glasses or glasses with clear lenses during the second week of the study. During the third week, participants will be assigned to wear the opposite pair of glasses. Sleep and wake behaviors are the primary study outcome.
Eligibility
Sex/Gender
ALL
Age
18 Years to 29 Years
Healthy volunteers
Yes
Inclusion criteria
1. Fluent English speaker and reader 2. Capable of providing one's own informed consent 3. Age 18 to 29 years old 4. Healthy, sighted individuals 5. Own an iOS smartphone (iPhone) 6. Willingness to update smartphone to access the current version of the Screen Time or StayFree application, depending on smartphone operating system 7. Willingness to participate in surveys, wear health monitoring devices, and provide screenshots of their smartphone's screentime application throughout the entire study
Exclusion criteria
1. Younger than 18 or older than 29 years 2. Individuals who are blind or wear corrective lenses 3. Taking prescribed medications that affect sleep 4. Recent shift work 5. Sleep disorder diagnosis or any cardiovascular disease
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Sleep onset | Throughout the duration of the study (~3 weeks) | Midnight-centered clocktime of when participant falls asleep at night |
| Sleep midpoint | Throughout the duration of the study (~3 weeks) | Midnight-centered clocktime denoting the middle of the nocturnal sleep episode |
| Total sleep time at night | Throughout the duration of the study (~3 weeks) | Length of time spent asleep during the night, excluding time spent awake throughout the sleep episode |
Countries
United States
Outcome results
None listed