'I worked late last night,' writes a lady, a novelist, 'went to bed, and dropped into a dead kind of sleep. When I woke this morning about seven a funny thing had happened. Two candles were burning in my room. When I went to bed I had only one burning, and I know I put that out. Now, there were two burning side by side as if I had been writing, and they had evidently been burning only an hour or so, I must have got up and lighted them in my sleep.'[76] The actions carried out in the somnambulistic condition are not usually co-ordinated with the action of higher emotions: thus, a young woman was impelled by a distended bladder, while still asleep, to get out of bed and proceeded to carry out the suggested action, but without further precautions, on to the floor; she was only awakened by an exclamation from her sister, who had been aroused by the sound. We seem to see that under a strong stimulus--unfinished work in one case, vesical tension in the other--the motor centres have awakened to activity in the early morning while the higher centres are still soundly asleep. If the second sleeper had not been awakened, in neither case would any memory of the incidents have remained.[77] There has been no struggle, and no resultant emotions have, therefore, been aroused to impress consciousness. It is evident that the lack of adaptation between sensory and motor activity is an important factor in dreams, and contributes to impart to them their emotional character. In somnambulism we have a state which is in some respects the reverse of that usual in dreams. The higher centres are, indeed, split off from the lower centres, but it is the former that are asleep and the latter are awake, whereas in ordinary dreaming the higher centres are acting in accordance with their means, while the lower centres are quiescent. Somnambulism is an approximation to a condition found in some diseases of the brain when, as a result of lesion of the higher nervous levels, we have a mental state--the ideatory apraxia of Liepmann--in which the muscular system carries out plans, but the plans are defective because not supervised by the higher centres. In ordinary dreams, on the other hand, we have a state comparable to that produced by brain lesions in what Pick terms motor apraxia, in which the higher centres are acting freely, but their plans are never carried into action owing to failure of the motor centres. This characteristic of dreaming has seemed puzzling to some writers. They ask why, in our dreams, we should sometimes be so conscious of failure of movement, and why, when we strive to move in dreams, we do not always actually move.[78]