Light Sleep: Screen Use and Sleep Health

Not Applicable

Completed

• Conditions: Glasses
• Interventions: Device: Blue light-blocking glasses; Device: Glasses with clear lenses

• Registration Number: NCT05342662
• Lead Sponsor: Penn State University

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.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2022-04-06
• Study First Submitted QC: 2022-04-18
• Study First Posted: 2022-04-25
• Study Start: 2022-11-23
• Status Verified: 2023-09
• Primary Completion: 2023-09-05
• Study Completion: 2023-09-05
• Last Update Submitted: 2023-09-12
• Last Update Posted: 2023-09-13

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 34

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

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Blue light-blocking glasses	Blue light-blocking glasses	Participants will wear blue light-blocking glasses to evaluate whether sleep behaviors improve.
Glasses with clear lenses	Glasses with clear lenses	Participants will wear glasses with clear lenses to serve as the control condition.

Primary Outcome Measures

Name	Time	Method
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
Sleep onset	Throughout the duration of the study (~3 weeks)	Midnight-centered clocktime of when participant falls asleep at night

Trial Locations

Locations (1)

Biobehavioral Health Building; 🇺🇸 University Park, Pennsylvania, United States