The pleasure of a sketchbook is the fact that I can always sketch. Wherever, whenever, late on sleepless nights or early in the morning, there is time to sketch. And the beauty of it is that the more you sketch, the better the sketches will be.
It's like reading in the sense that the more you read, the more your visual imagination can grow and the faster you can read. This is where I find solace during the rough times.