I usually read for about 30-60 minutes a day before bed, I find it helps me switch off and sleep well. I've recently been working my way through some classics which have been reissued, properly typeset etc., by Amazon on Kindle for free: https://www.amazon.com/b?ie=UTF8&node=18660703011. The best one I've read so far is Count of Monte Cristo - it's long but it's one of those books where you get really engrossed in its world and you're really sad when it is over!