I make my living from writing and publishing books, so spend most of my life either writing, editing, or reading.
I have thousands of paper books, and maybe a hundred ebooks, which I've read on a laptop, an iPad, and an iPhone 6+.
I tried a Kindle and didn't like it. The eReading experience is nicer using the iPad with the Kindle app, but one level nicer again using Apple's iBooks app. The only problem with this compared to a dedicated eReader is if you want to read outside in the sun. The iPad then sucks, of course.
Reading from a screen at night is a real problem, it does mess with your sleep. Still, you can install f lux on your computer, which I've found fantastic in helping me sleep better — it stops the screen emitting blue light at night, so your brain doesn't think it's daytime any more, and starts to wind down. HUGE help. (Just don't try to do Photoshop work with it on, everything's sort of pink!)
Someone else said many eBooks have bad formatting and typos. Absolutely they do — but this is because so many people are self-publishing, and not because of the medium itself. In fact, paperbacks are MUCH more difficult to format correctly, and there are now some terrible paperbacks around also.
Ebooks are okay for novels, but I rarely buy them any more for non-fiction. When we need to learn stuff from reading, our brains make a map of where we read it, sort of. But mostly, we need to read something more than once to learn it, and because of the nature of eBooks, the location of that information is in a different place each time we read it. Click forward a few pages in any eBook, then go back, and the words will be in a different place on the page. So the map to where to find the information is corrupted and confusing, and our brains don't trust the information as well as it they need to. Also, despite the theory being that eBooks are better because their text is searchable, in the real world a paperback is much easier to find what you want MOST of the time.
So I think that if you prefer paper books, you should read those as much as you can. That's what I do, anyway.