Darius Foroux short piece in the Observer, gives you some useful advice on how to get on with your reading and read more books.
Simple advice really, but I usually read just one book at a time, which actually doesn't make sense. If for example, I read a book about personal development, it will take time to process the book, so then reading something like a novel alongside seems only logical.
But, eat when your eat – that's my two cents.
There are no rules to reading so you can do whatever you want. At times, I'm reading 5 books at once. I might read 50 pages of one book in the morning and then read another book in the afternoon.
That's how I prefer it. Others like to read a book cover to cover and only then read something new.
If you're reading something that's complicated, you might want to read something that's easier for the evenings. I like to read biographies before I go to sleep because they are like stories. Fiction also works well in the evening.