&gt;&gt;I wonder what the mechanism is here.&lt;&lt;<p>Possibly introversion which is NOT a disorder. Perhaps you just enjoy personal time and feel at peace.<p>Psychology today:  <a href="https:&#x2F;&#x2F;www.psychologytoday.com&#x2F;blog&#x2F;fulfillment-any-age&#x2F;201108&#x2F;there-s-more-introversion-you-might-think" rel="nofollow">https:&#x2F;&#x2F;www.psychologytoday.com&#x2F;blog&#x2F;fulfillment-any-age&#x2F;201...</a>