Over-stimulation
Psychologically, it is possible to become habituated to a degree of stimulation, and then find it uncomfortable to have significantly more or less. Thus one can become used to an intense life, or television, and suffer withdrawal when they are removed, from lack of stimulation, and it is possible to also be unhappy and stressed due to additional abnormal stimulation.
It is hypothesized and commonly believed by some that psychological habituation to a high level of stimulation ("over-stimulation") can lead to psychological problems. For example, some food additives are hypothesized to cause children to become prone to over-stimulation, and ADHD is, theoretically, a condition in which over-stimulation is a part. However, ADHD is believed to be a heterogeneous disorder with genetic, environmental and psychosocial causes among which food additives may the part. It is also hypothesized that long term over-stimulation can result eventually in a phenomenon called "adrenal exhaustion" over time, but this is neither medically accepted nor proven at this time.
What is sure is that ongoing, long term stimulation, can for some individuals prove harmful, and a more relaxed and less stimulated life may be beneficial. See also; sensory overload and burnout.
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