Indoor lighting, of course, doesn’t compare to the power of the sun, but it actually emits more light than the moon and stars. This leads to poor sleep if we use artificial lighting too close to bedtime.
So, by keeping your room dark at night, you not only will get to sleep faster and wake up feeling more rested, but you’ll also have a lesser risk of developing health problems due to excess nighttime light exposure.
Taken from research presented in this article, you will likely fall asleep faster due to an increase in melatonin levels, your blood glucose levels and blood pressure will decrease, and you will have less chance of developing serious diseases such as cancer, heart disease, and diabetes, to name a few. In addition, you’ll wake up feeling more rested, and if you have insomnia, sleeping in darkness and committing to turning off lights a few hours before bed could help tremendously.