According to the Diagnostic and Statistical Manual of Mental Disorders, (DSM-5-TR), nightmares are defined as repeated dreams that cause significant distress or functional impairment, and the disturbance is not due to other mental disorders, medical conditions, or the effects of substances. It affects approximately 2-5% of adults in the general population.
Nightmares can negatively impact the quality of sleep and can lead to:
Sleep deprivation
Impaired daytime functioning
Anxiety
Distress
Emotional dysregulation
Blue light is a type of high-energy visible light emitted by electronic devices and artificial lights. The wavelength range is typically between 400 and 500 nanometers. The screens of electronic devices such as smartphones, tablets, laptops, and televisions, as well as LED and fluorescent lighting, emit blue light that may disrupt our natural sleep cycle.
The amount of time individuals spend visually interacting with digital devices is termed "screen exposure." We are living in an era of sensory and visual overload. Screen exposure
has increased over the last decade. Blue light emitted from screens confuses the brain into thinking that it’s daytime and affects the release of the sleep-inducing hormone melatonin. [2]
This highlights the growing concern around blue light and sleep quality in modern lifestyles.
Stage 1 (N1): It occurs as a person first falls asleep and lasts around 1-7 minutes.
Stage 2 (N2): Certain changes start taking place in the body during this phase, leading to muscle relaxation, a decline in body temperature, and slow breathing. It lasts about 10–25 minutes.
Stage 3 (N3) This stage involves deep sleep and helps the body with recovery and growth. Its duration is around 20-40 minutes.
Stage 4 (REM Sleep) In this stage of the sleep cycle, brain activity increases, leading to dreams, and the body becomes temporarily paralyzed. This stage usually lasts between 10 and 60 minutes. It plays an important role in brain maturation, regulating emotions, memory consolidation, and supporting brain neurotransmitter systems. [3]
A person experiences 4-7 sleep cycles per night. Each cycle progresses from N1, N2, N3, and REM, lasting between 90 and 110 minutes. Most nightmares occur during the REM stage of sleep, especially in the later part of the night. The REM stage of the sleep cycle can become affected by stress, trauma, irregular sleep timings, and deprivation, often leading to nightmares. A study examined how REM sleep shows a compensatory increase, known as the REM rebound effect, after a period of sleep deprivation or disrupted sleep due to late-night screen use or blue light exposure, leading to more vivid, intense, and emotionally charged dreams. [4] [5]
Increasing evidence shows a strong relationship between blue light and sleep quality, particularly in how REM rebound may lead to more intense and frequent nightmares.
A mental, emotional, or sensory experience that takes place during sleep is defined as a dream. Dream experiences vary immensely from person to person. Dreams are harmless most of the time. But disturbing dreams called nightmares can start to impact sleep quality if they become recurrent. Although nightmares can happen during any stage of sleep, they are most intense during the REM stage.
The quality of our dreams is mainly defined by:
Dream frequency
Intensity of dreams
Repeated nightmares
Ability to recall
Frequent breaks in the natural flow of the sleep cycle due to noise, stress, or notifications shorten the REM stage of the sleep cycle, disrupting emotional regulation and memory consolidation, leading to unprocessed stress and a rise in nightmare frequency and recall. The quality of our dreams often reflects our emotional health, stress levels, and lifestyle habits, such as screen exposure before bed.
MedBound Times connected with Dr. Jasmine Mumtaz, MBBS, MD (Psychiatry), a specialist psychiatrist at Lifeline Clinic, Dubai, U.A.E., to better understand how screen exposure is influencing sleep quality and contributing to nightmare disorders. Explaining this mechanism, Dr. Jasmine Mumtaz states:
Exposure to blue light, particularly from late-night screen use, suppresses melatonin release and disrupts normal sleep architecture, often leading to REM rebound, the stage where vivid dreaming occurs. When this is combined with the mental and emotional stimulation of digital engagement, the brain remains in a heightened state of alertness rather than emotional processing. This increases the likelihood of distressing dreams and makes them more likely to be remembered upon waking, effectively turning an unhealthy digital habit into a potential contributor to nightmare disorder. This highlights how excessive nighttime device use can transform routine screen habits into a significant contributor to sleep disturbance and recurrent nightmares.Dr. Jasmine Mumtaz, MBBS, MD (Psychiatry)
Melatonin
The Sleep Hormone Exposure to blue light at bedtime can trick our bodies into slowing the release of melatonin, a hormone produced by the pineal gland that regulates our body's sleep cycle. Its release is triggered by darkness and peaks at night to promote relaxation. When our eyes are exposed to blue light before bedtime, signals are sent to the brain that suppress melatonin production, keeping us alert and awake.This mechanism explains the critical link between blue light and sleep quality, as reduced melatonin delays sleep onset and disrupts normal sleep cycles.
Special cells in the eye act as light sensors and detect blue wavelengths very strongly. The brain's circadian clock (the master clock in the brain that controls the body's 24-hour rhythms) is located in the hypothalamus, which receives signals from these retinal ganglion cells and interprets these signals to determine the time of day and help regulate circadian rhythm (24-hour biological cycles of sleep, hormone release, and body temperature). Excessive exposure to blue light disrupts these rhythms by keeping the brain alert and disturbing normal sleep patterns. [6]
People working in shifts
Unhealthy sleeping habits
People with irregular sleep discipline
People with sleeping problems
Psychiatric conditions like anxiety and PTSD
Environmental factors like sleeping arrangements, bedroom lighting
Young people and older adults, due to boredom
Blue light in the 460-480 nm range is strongly detected by photosensitive retinal ganglion cells, which directly influence the suprachiasmatic nucleus: the brain’s master circadian clock. From an ophthalmology perspective, excessive evening exposure to digital screens suppresses melatonin, delays sleep onset, and can destabilize REM sleep. Since REM is critical for emotional processing and dream regulation, this disruption may contribute to more vivid dreams and increased nightmare frequency.Dr. Lubna Ahmed, Vitreo-Retina Fellow, Prakash Netra Kendra
Sleep is an important aspect of human life, though often neglected, yet it is one of the major contributors to a healthy lifestyle. It provides numerous benefits, including emotional regulation, stress management, physical recovery, support for brain growth, and memory strengthening, helping our thought processes remain sharp and clear.
Use night mode on devices.
Blue light blocking glasses.
Limiting screen use to at least 1-2 hours before bedtime
Dim lighting in the bedroom
Relaxation techniques before going to bed
Avoiding emotionally disturbing or stimulating screen content near bedtime
Raising awareness about the effects of screen use and blue lights on sleep quality
Consistent sleep schedule
A supporting and comfortable sleep environment
Natural daylight exposure
Avoiding caffeine and alcohol before bedtime
Eliminating light and noise disruptions
Assessment of a nightmare disorder involves:
Enquiring about evening screen habits
Duration of screen exposure
Sleeping environment
Behavioral interventions such as limiting device use, adjusting lighting, imagery rehearsal therapy, cognitive-behavioral therapy for insomnia, and monitoring outcomes play a major role in improving sleep quality and overall health.
Today's world is driven by technology, and screens rule the space. Late-night screen use has become routine and is affecting how we sleep and dream. Increasing evidence suggests that blue light exposure disrupts the sleep cycle and may increase nightmare frequency. Differences in individual lifestyles, stress levels, caffeine intake, and bedtime routines also play an important role.
Educating people about digital sleep hygiene, including limiting technology use, reducing stress, engaging in physical activity, managing the sleep environment, and establishing bedtime routines, can help improve sleep quality, dream quality, emotional balance, and overall health. In short, while the science linking blue light to nightmares is still developing, the evidence supporting its impact on sleep is strong enough to justify caution and better nighttime habits.
Disclaimer: This article is intended for informational and educational purposes only and should not be considered medical advice. Sleep disturbances, including nightmare disorder, may have multiple causes that require individualized evaluation and management. Readers experiencing persistent sleep problems, nightmares, or related health concerns should consult a qualified healthcare professional for proper diagnosis and treatment. The information provided here does not replace professional medical consultation, diagnosis, or treatment.
References:
1. Gradisar M, Wolfson AR, Harvey AG, Hale L, Rosenberg R, Czeisler CA. The Sleep and Technology Use of Americans: Findings from the National Sleep Foundation’s 2011 Sleep in America Poll. J Clin Sleep Med [Internet]. 2013 [cited 2025 Nov 6]; 9(12):1291–9. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3836340/.
2. Zisapel N. New perspectives on the role of melatonin in human sleep, circadian rhythms and their regulation. Br J Pharmacol [Internet]. 2018 [cited 2025 Nov 6]; 175(16):3190–9. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6057895/.
3. Maquet P, Laureys S, Peigneux P, Fuchs S, Petiau C, Phillips C, et al. Experience-dependent changes in cerebral activation during human REM sleep. Nat Neurosci. 2000; 3(8):831–6.
4. Nielsen T, Levin R. Nightmares: A new neurocognitive model. Sleep Medicine Reviews [Internet]. 2007 [cited 2025 Nov 6]; 11(4):295–310. Available from: https://linkinghub.elsevier.com/retrieve/pii/S108707920700041X.
5. Ocampo-Garcés A, Molina E, Rodríguez A, Vivaldi EA. Homeostasis of REM sleep after total and selective sleep deprivation in the rat. J Neurophysiol. 2000; 84(5):2699–702.
6. Silvani MI, Werder R, Perret C. The influence of blue light on sleep, performance and wellbeing in young adults: A systematic review. Front Physiol [Internet]. 2022 [cited 2025 Nov 6]; 13:943108. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9424753/
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