I keep YouTube videos turned down to 360 for this reason.
I get a strange feeling of vertigo if I see hd content above 30fps. The first time I met friends in a bar that was plastered with big screens playing a football game at 60fps was very uncomfortable.
-Lack- of magnesium can cause cramps.
Supplementing magnesium can help lots of people since it is lacking in many people's diets. It can also help you get more and better sleep, just avoid magnesium oxide, that will just make you poop and is unfortunately the form used in many supplements and multi vitamins.