"I do use a Kindle app on my tablet for at least an hour before bed...."
That needs to stop if it's affecting your sleep pattern.
I read in bed, but I use a Kindle. There's no blue light emission.
This tells you about the blue light problem. You may have seen it, but others might be interested. Lots of people use tablets and laptops before going to sleep, and lots of them suffer from sleep disruption as a result
Thanks all, especially Fruit Bat. That link was worth a read.
I'm reluctant to go back to a Kindle, the screen is a bit small and by the time I get the font to a size I can read I am only getting about 3 lines per page (my tablet is a 12.2)! I also use the tablet to look at the late news, next day's weather and my schedule. I also play a few games of patience.
There does appear to be something in it, so I'll start looking at the sleep aware apps
I am not sure what type of light television's omit, but with the colder evenings, darker nights and more expensive fuel bills, its becoming more evident (around my location at least) that bedroom televisions are becoming more popular!.