The proofs are many that dreams may be suggested by the influence of other minds in unconscious communication with the sleeper. If the finger be placed upon the head where, according to the phrenologists, is the seat of the mental faculty of mirth, a smile will be seen soon to steal upon the sleeping face. Touch in like manner the asserted seats of combativeness or destructiveness, the features assume an aspect of excitement which will be removed by touching the asserted seat of benevolence. The explanation of this phenomenon is that the brain thus excited to action suggests or moulds a dream in accordance with the emotion thus denoted. This fact has been advanced by the phrenologists as proof that they have rightly mapped out the brain. But such is not the necessary conclusion from the fact. It may well be that it is the _mind_, and not the finger, of the waking operator that directs the mental action of the unconscious sleeper. The waking _Will_ possibly controls the sleeping Will. We know that it does so in Somnambulism and it is probable that it does the like in ordinary sleep. But, explain it as we may, the fact remains. Direct suggestion of dream by external causes is less disputable. So sensitive is the mind in sleep, when relieved from the thronging impressions of the senses, that impressions so slight as to be wholly unnoticed in our waking state are doubtless perceptible and operate as suggestions when we are asleep. A slight touch or sound often serves to change the entire character and direction of a dream, the mere sound giving rise to the train of new ideas thus suggested, because it is uncontrolled by the Will. The surest method of banishing an unpleasant dream is to turn in the bed. Continuance in the same posture and with the same pressure of blood within and of the pillow without upon the same part of the brain seems to preserve the action of the dream, which is disturbed at once by directing the flow of blood and the pressure to another part of the brain. If a sleeper is seen to be agitated in his sleep by painful dream, exhibited in moaning, restlessness and expression of distress upon the countenance, remedy may be found in gently moving the head into another position, if the body cannot be moved and it is not desired to waken.