The e-reader comes in a variety of brands and styles. From a very simple Kindle reader to the Fancy, full color Fire with lots of different brands. I recommend the simpler, black and white versions and here is why.
The black and white e-readers are actually a completely different technology from any other tablet. They use a special method of displaying things called e-ink. Instead of lighting up an entire screen and populating the screen with different colors, this e-ink displays black characters on a blank screen. This has several advantages:
1) This device uses a lot less electricity. It doesn't even take any for it to have the screen running. It only uses a little bit when you change the page
2) Because there is no light to wash out you can see this, just like a book in direct sunlight.
3) This is very close to a normal paper and is much better on your eyes. No light in the screen means you aren't looking at glare. No lit screen also means that you don't have the problems associated with looking at a lit screen disrupting your sleep patterns.
Yes you will need a night light if you are going to read at night but everything else will be more comfortable.