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You are very well aware of the fact that smartphones release a blue light that allows you to read clearly even during a sunny day. This light is emitted by all the devices like laptops, TV and other gadgets too. This light is known to imitate the sun and thereby confuse the brain, making it think that it is day outside even if it is night. Due to this, the brain stops to release melatonin and you'll not be able to sleep well at night.