Rest for the mind is as necessary as rest for the body, and yet we always keep the mind in action. It is constantly at work even if our body is resting. Even if the body is sleeping, the mind is producing dreams, and is constantly at work. Many people stand at their work the whole day, during which the mind is no less busy with the work on the physical planes than is the body, for mind works with body; and yet they work with the mind the whole night long. The body is having rest and comfort, but not the mind. Even in an armchair they are still imagining, still working with the mind.