Sometimes this sleep is deep and lasting, and the patient is totally insensible; but the interesting phase of the condition is that in certain stages the patient is only partially asleep, while the other part of his brain is awake and very active.
It is well known that one part of the brain may be affected without affecting the other parts. In hemiplegia, for instance, one half of the nervous system is paralyzed, while the other half is all right. In the stages of hypnotism we will now consider, the will portion of the brain or mind seems to be put to sleep, while the other faculties are,abnormally awake.
