How does light work for sleep? The timing of your circadian rhythm is strongly affected by light. The brain shuts down melatonin when it is exposed to light. This can be used to your advantage to help regulate your sleep patterns or reset your body clock.
People with a circadian-rhythm disorder such as Advanced Sleep Phase Disorder or Delayed sleep phase disorder will benefit from exposure to bright light. Light therapy can be used to restore normal sleep patterns for people suffering from jet lag or shift work sleep disorder. Although sunlight is the best light source to reset your internal clock, it is not always possible. There are many commercially available light boxes that can be used for this purpose. These boxes mimic the wavelength of sunlight and do not have harmful ultraviolet effects.
You can also buy commercially available light-blocking sunglasses that do the opposite to the light box. Light wakes you up, while darkness makes you sleepy. The glasses block light that causes wakefulness. These glasses are useful for people who work shifts and can’t sleep in the evening due to a disruption of their body clock.
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Disclaimer: The information contained on this channel is intended for education purposes only and does not constitute specific/personal medical advice. The videos and the answers to questions/comments do not create a doctor-patient relationship. These videos may be helpful for you if you are a patient of your own doctor.