Answer:
A - It increases stress and negatively affects your sleep.
Hope that helps. x
Explanation:
I think that you might have used it a lot or its just a glitch and will come back after some time.
It might be that your screen cracked.
But try re-booting if that does not work, wait and take off the battery.
Kind of negative social impact has had today is debates on social networking and dating and wireless communications are destroying kids from ages 12-16 these 21st century devices are frying are worlds society.