Blocking nocturnal blue light for insomnia: A randomized controlled trial.

Area of Science:

• Sleep Medicine
• Ophthalmology
• Behavioral Science

Background:

• Electronic device use before bedtime is linked to sleep disturbances.
• Blue light emission from devices can suppress melatonin and increase arousal, negatively impacting sleep.
• Insomnia is a prevalent condition affecting millions worldwide.

Purpose of the Study:

• To investigate the efficacy of amber-tinted blue light-blocking lenses in improving sleep for individuals with insomnia.
• To assess the impact of these lenses on subjective and objective sleep parameters.

Main Methods:

• A randomized crossover trial involving 14 participants with insomnia symptoms.
• Participants wore either blue light-blocking amber lenses or clear placebo lenses for 2 hours before bedtime for 7 consecutive nights.
• Sleep was assessed using the Pittsburgh Insomnia Rating Scale (PIRS), daily questionnaires, and wrist-actigraphy.

Main Results:

• Amber lenses significantly improved PIRS scores, including Quality of Life, Distress, and Sleep Parameter subscales.
• Subjective measures showed delayed wake time, increased total sleep time (TST), and improved sleep quality and soundness with amber lenses.
• Actigraphy confirmed a significant increase in TST with amber lenses compared to clear lenses.

Conclusions:

• Wearing blue light-blocking amber lenses for 2 hours before bedtime for one week effectively improved sleep in individuals experiencing insomnia symptoms.
• Amber lenses offer a safe, affordable, and easily implementable therapeutic option for managing insomnia.
• These findings are significant given the widespread use of electronic devices and the high prevalence of insomnia.