Texting before lights out did not affect academic performance, the study showed.

Although females reported more messaging overall and more daytime sleepiness, they had better academic performance than males.

The researchers attributed this to the fact that the girls texted primarily before turning off the light.

The effects of 'blue light' emitted from smartphones and tablets are intensified when viewed in a dark room.

This short wavelength light can have a strong impact on daytime sleepiness symptoms since it can delay melatonin release -- a hormone that helps control sleep, making it more difficult to fall asleep - even when seen through closed eyelids, the researchers noted in the study published in the Journal of Child Neurology.

 

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