I know this. You know this. Most people still act like it doesn’t matter. Most people are stupid.
Light-exposure can be good or bad depending on when it occurs. As mentioned in the post “electronic devices before sleep?” which highlights the results from Chang et al. 2014, your nighttime Ipad/kindle-reading will have adverse effects on your sleep and health.
The infographic below sums it up pretty nicely: If you exposure yourself to (blue) light before bedtime, you´re going to have a bad time!