Mobiles and Melatonin: Why is it harder to fall asleep after being on your phone?

For most of us, phones are a regular part of the evening wind-down, but that late night scroll may be exactly the reason you're struggling to fall asleep. The light from phone screens can disrupt the brain's internal clock, which slows the production of the sleep hormone melatonin, making us feel wide awake. The video below explains this common problem in more detail.