From Sleep, Sugar and Survival: What You Need to Know – thatsfit.ca:

Another point the author makes is, by exposing ourselves to bright lights after dark — even in bed, we interfere with the natural melatonin production necessary for a proper sleep. And while you may think you can get by on only few hours of rest, it’s taking its toll. Not getting a proper sleep has been tied to everything from obesity to breast cancer. A new study out of Israel has even tied lower melatonin production — because of light exposure after dark — to lower infant mental capacity.

Recently I’ve been watching TV in bed, and this article gives some good reasons why that’s a bad idea. I also like to read on my iPad in bed which could have similar negative effects. Fortunately, the Kindle and Instapaper apps both support a light text on black background mode, which when combined with lowering the brightness of the screen hopefully compensates to the extent that the effects are not the same as if you were watching a bright screen or had bright lights on.

I hope.