May 04, 2023

Phototherapy device has potential to be a nov

Participants reported better subjective sleep after wearing collar that emits near-infrared light

American Academy of Sleep Medicine

image: Phototherapy Device Photos view more

Credit: University of Arizona

DARIEN, IL – Wearing a phototherapy device that emits near-infrared light is associated with potential therapeutic benefits for sleep and daytime functioning, according to a new study to be presented at the SLEEP 2023 annual meeting.

Results show that self-reported, sleep-related symptoms improved after three weeks of treatment. Participants in the active treatment group reported experiencing better sleep quality, feeling more refreshed and relaxed, and functioning better during the day.

"This novel phototherapy device — while still being explored and in need of further research — appeared to be generally well-tolerated by a small group of participants," said lead author Kathryn Kennedy, a doctoral candidate in the department of psychiatry at the University of Arizona in Tucson. "Those with active, light-emitting devices — as opposed to the inert sham devices — self-reported an increase in relaxation and better sleep with use."

According to the authors, transdermal delivery of near-infrared light exhibits several therapeutic properties, including increased relaxation, likely through stimulation of parasympathetic activity. However, the benefits of near-infrared light delivery for sleep and next-day daytime functioning have been unexplored.

The five-week, randomized, sham-controlled study involved 30 adults between the ages of 30 and 60 years. Each participant reported having sleep complaints but did not have a sleep disorder. After a two-week baseline period, participants wore a cervical collar every other night before bed for three weeks. For those in the active treatment group, the collar emitted near-infrared light, and for those in the sham treatment group, the collar was inactive. Participants completed questionnaires about physical symptoms and insomnia severity, and they provided daily ratings of measures such as sleep quality, perceived changes to sleep, feeling refreshed, relaxation, and daytime functioning. Results were compared between groups.

Kennedy noted that while there are many sleep trackers in the marketplace, there are few wearable devices targeted at improving sleep and next-day performance, making near-infrared light an intriguing candidate with potential to become a novel treatment for sub-clinical sleep complaints.

"Given the emerging field of photobiomodulation and its potential neuroprotective and vasodilating effects, this red-light and near-infrared emitting device may be useful if milliwatt power level, dosage, and frequency of use are refined," she said.

The research abstract was published recently in an online supplement of the journal Sleep and will be presented Tuesday, June 6, during SLEEP 2023 in Indianapolis. SLEEP is the annual meeting of the Associated Professional Sleep Societies, a joint venture of the American Academy of Sleep Medicine and the Sleep Research Society.


Abstract Title: A randomized, sham-controlled pilot trial of a novel near-infrared phototherapy device on sleep and daytime functionAbstract ID: 0378Poster Presentation Date: Tuesday, June 6, 12 p.m. to 1:15 p.m. EDT, Board 270Presenter: Kathryn Kennedy

For a copy of the abstract or to arrange an interview with the study author or a sleep expert, please send an email to [email protected].

About the Associated Professional Sleep Societies, LLC

The APSS is a joint venture of the American Academy of Sleep Medicine and the Sleep Research Society. The APSS organizes the SLEEP annual meeting each June.

About the American Academy of Sleep MedicineEstablished in 1975, the AASM advances sleep care and enhances sleep health to improve lives. The AASM has a combined membership of 12,000 accredited sleep centers and individuals, including physicians, scientists and other health care professionals who care for patients with sleep disorders. As the leader in the sleep field, the AASM sets standards and promotes excellence in sleep medicine health care, education and research (

About the Sleep Research Society

The SRS is a professional membership society that advances sleep and circadian science. The SRS provides forums for the exchange of information, establishes and maintains standards of reporting and classifies data in the field of sleep research, and collaborates with other organizations to foster scientific investigation on sleep and its disorders. The SRS also publishes the peer-reviewed, scientific journals Sleep and Sleep Advances (

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