In fact, I sometimes have three going at the same time. It probably isn’t good idea, but here’s how it happens.
When I hit the sack of an evening I like to read for a while but, being in the sack, it has to be something relaxing. If it was heavy, I might well end up in a deep sleep too soon. So I go for a mystery or a crime novel.
During the day, I can handle something literary and/or more demanding. I found James Salter’s memoir, ‘Burning the Days’, rewarding but demanding – so I read it in short bursts during the day, but never in bed. Likewise Richard Ford’s novel ‘Canada’.
As for a third book, that would usually be non-fiction: Robbing a Bank for Dummies, How to Lose a Fortune on the Forex Market, Large Knot Macramé for Beginners.
Are your reading habits better than mine?