Reading is good for you in so many ways, getting lost in a story is a wonderful thing. If you are depressed, though, you may find that it is beyond you at the current time. When I have been grieving in the past I have not been able to concentrate on reading enough to follow the story. However, if I set myself up with an audio book and my needlework or art journaling, I can escape into the story.
Reading improves cognitive function.
21 Reasons Reading Will Make You Happier
Read Something for Fun.
Take a break, sit down and read something that will make you feel better. I recommend, Harry Potter, The Ranger's Apprentice or something else for the child in you.