I wonder if some of this is due to the brain reacting to the sort of sensory deprivation that meditation entails. Meditation is quite hard work, because you are

I wonder if some of this is due to the brain reacting to the sort of sensory deprivation that meditation entails. Meditation is quite hard work, because you are trying to prevent your unconscious mind from controlling your consciousness. With the latter 'cut off' from the normal constant input from the former, I wonder if it can sometimes react to that badly?