How do you know when a snake is going into a shed?

You can usually tell when a snake is going to shed when there is a dull looking film over the eyes of the snake. Most of the time a snake will not eat when it is getting ready to shed it's skin, and there may be flaky, dry skin on it's back. Once it sheds, it's scales will have a different appearance. The snake will have a smoother appearance, and the eyes will be very clear and lose the dull appearance.