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givinghealthylife.com oing to think about going to bed.
Can you remember a time when you are lying in bed or in a dark room starting with the screen of your mobile phone or your laptop? Maybe you have to send an email before going to bed, or do you have to finish the last stage of Candy Crush before retiring to bed?
The light that is emitted from your phone or your computer is called 'blue light' and is harmful at night. Let's see why.
Your normal circadian rhythm
For millions of years, the sun has been the main source of light for all creatures on earth, including humans.
It is rare that we need artificial light sources during the day, unless we are in a closed space that does not have windows. While the day is good for light, night is a different story. How many of you can remember a time when we did not have cell phones, advanced electronic devices or low-energy bulbs (compact fluorescent lights or CFLs) and rely on good tube lamps or low-voltage bulbs to light our homes?
Our body has an internal clock that activates it during the day and numbs at night. This circadian rhythm is responsible for keeping us alert and attentive, and depends to a large extent on external light. The average duration of a circadian rhythm is 24 hours and a quarter (24 hours and 15 minutes). This varies in people who have late nights or those who work night shifts.
Our circadian rhythm depends on the release of melatonin, a hormone released in the brain that helps us sleep. During the day, hormone levels are very low, while at night they are high and help you fall asleep. However, if you are exposed to light for long hours at night looking at your phone or computer or even when you sleep with the light on, your melatonin levels will remain low. This could alter your circadian rhythm, confuse your brain and keep you awake longer.
Blame the blue
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