"Sometimes I get to the point where I can't keep my eyes open after 30 mins in which case I pack away the book or kindle and go to sleep. "
Agree and I would add that an excellent way that I have found to get back to sleep (if you wake up in the middle of the night) is to do something similar. Although there are many things that say otherwise, I actually find that I can pull out the iphone, read for 30 to 40 minutes (even with the bright light) and I will fall back to sleep for the rest of the night. (In other words when laying there for 5 or 10 minutes doesn't do the trick.)
Agree and I would add that an excellent way that I have found to get back to sleep (if you wake up in the middle of the night) is to do something similar. Although there are many things that say otherwise, I actually find that I can pull out the iphone, read for 30 to 40 minutes (even with the bright light) and I will fall back to sleep for the rest of the night. (In other words when laying there for 5 or 10 minutes doesn't do the trick.)