Earlier quoted context omitted.
This frightens me. I have been working at reducing my time of watching videos in bed, and all I have to tempt me is a phone and a laptop. It's such an easy trap to fall into. Spending time horizontal while not asleep is very unhealthy for your heart, and many other systems in your body.
> Spending time horizontal while not asleep is very unhealthy for your heart. Why is this?
[0] https://www.betterhealth.vic.gov.au/health/healthyliving/the...
see my other comment for other references: https://news.ycombinator.com/item?id=40549893