I love reading the New York Times on my iPhone when I have spare moments. Sorry to say that this is the first and last activity I do while in bed.
Over the last two weeks I have noticed that my thumb joints have aches. I just wrote it off to aging. As I observed the use of my thumbs during the day I realized this pain has increased with my reading of the NYT. It is exacerbated by writing emails on my phone.
I also notice that using my eyes this way - narrow, small focus and squinting - also causes ocular pain. Lesson I am learning: relax in bed and buy a paper.