What exactly is blue light and how does it actually affect sleep? We're all familiar with the advice that screens such as T.V., iPads etc aren't recommended close to children's bedtime (nor ours for that matter!) But why is that and what harm do they actually do? Exposure to blue light isn't helpful close to bedtime because it hinders the production of melatonin (the "sleepy" hormone). However, blue light isn't all bad! The role of blue light is to promote alertness and performance. Did you know