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OpenTrials
Completed

NCT Number: NCT05342662

Light Sleep: Screen Use 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.

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Key information

Conditions

Glasses

Age range

18 year–29 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Biobehavioral Health Building

University Park, Pennsylvania, 16802, United States

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Fluent English speaker and reader
  • Capable of providing one's own informed consent
  • Age 18 to 29 years old
  • Healthy, sighted individuals
  • Own an iOS smartphone (iPhone)
  • Willingness to update smartphone to access the current version of the Screen Time or StayFree application, depending on smartphone operating system
  • Willingness to participate in surveys, wear health monitoring devices, and provide screenshots of their smartphone's screentime application throughout the entire study

Exclusion criteria

  • Younger than 18 or older than 29 years
  • Individuals who are blind or wear corrective lenses
  • Taking prescribed medications that affect sleep
  • Recent shift work
  • Sleep disorder diagnosis or any cardiovascular disease

Treatment and study plan

Blue light-blocking glasses

Device

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

Glasses with clear lenses

Device

Non-blue light-blocking glasses

Other names: Swanwick glasses

Primary outcomes

  1. Sleep onset

    Time frame: Throughout the duration of the study (~3 weeks)

    Midnight-centered clocktime of when participant falls asleep at night

  2. Sleep midpoint

    Time frame: Throughout the duration of the study (~3 weeks)

    Midnight-centered clocktime denoting the middle of the nocturnal sleep episode

  3. Total sleep time at night

    Time frame: Throughout the duration of the study (~3 weeks)

    Length of time spent asleep during the night, excluding time spent awake throughout the sleep episode

Sponsors and collaborators

Lead sponsor

Penn State University

Other

Registry information

Official study title

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

Acronym: LS

Important dates

Study start
2022
Primary completion
2023
Study completion
2023
First posted
Apr 25, 2022
Registry last updated
Sep 13, 2023

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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