Light Sleep: Screen Use and Sleep Health (LS)

Evaluating the Consequences of Mistimed Light-emitting Device Use on Cardiac Activity and Sleep Health

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.

Study Overview

• Status: Completed
• Conditions: Glasses
• Intervention / Treatment: Device: Blue light-blocking glasses; Device: Glasses with clear lenses

• Study Type: Interventional
• Enrollment (Actual): 34
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Pennsylvania
    • University Park, Pennsylvania, United States, 16802
      • Biobehavioral Health Building

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 29 years (Adult)
• Accepts Healthy Volunteers: Yes

Description

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 Plan

How is the study designed?

Design Details

• Primary Purpose: Other
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Single

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Blue light-blocking glasses; Participants will wear blue light-blocking glasses to evaluate whether sleep behaviors improve.	Device: Blue 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.; Other Names: Swanwick Night Swannies
Placebo Comparator: Glasses with clear lenses; Participants will wear glasses with clear lenses to serve as the control condition.	Device: Glasses with clear lenses; Non-blue light-blocking glasses; Other Names: Swanwick glasses

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Sleep onset	Midnight-centered clocktime of when participant falls asleep at night	Throughout the duration of the study (~3 weeks)
Sleep midpoint	Midnight-centered clocktime denoting the middle of the nocturnal sleep episode	Throughout the duration of the study (~3 weeks)
Total sleep time at night	Length of time spent asleep during the night, excluding time spent awake throughout the sleep episode	Throughout the duration of the study (~3 weeks)

Collaborators and Investigators

• Sponsor: Penn State University
• Investigators: Principal Investigator: David Reichenberger, MS, Department of Biobehavioral Health

Study record dates

Study Major Dates

• Study Start (Actual): November 23, 2022
• Primary Completion (Actual): September 5, 2023
• Study Completion (Actual): September 5, 2023

Study Registration Dates

• First Submitted: April 6, 2022
• First Submitted That Met QC Criteria: April 18, 2022
• First Posted (Actual): April 25, 2022

Study Record Updates

• Last Update Posted (Actual): September 13, 2023
• Last Update Submitted That Met QC Criteria: September 12, 2023
• Last Verified: September 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Physiological Effects of Drugs; Adrenergic Agents; Neurotransmitter Agents; Molecular Mechanisms of Pharmacological Action; Autonomic Agents; Peripheral Nervous System Agents; Neurotransmitter Uptake Inhibitors; Membrane Transport Modulators; Dopamine Agents; Dopamine Uptake Inhibitors; Central Nervous System Stimulants; Sympathomimetics; Adrenergic Uptake Inhibitors; Methamphetamine
• Other Study ID Numbers: STUDY00019746

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Plan Description: All processed IPD data that underlie results in a publication
• IPD Sharing Time Frame: Starting 1 year after the last publication based on collected data
• IPD Sharing Access Criteria: Interested parties should contact David Reichenberger (reichenberger@psu.edu)
• IPD Sharing Supporting Information Type: ANALYTIC_CODE

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No