Bill Walsh is a mind pioneer. This brief video on one depression biotype - undermethylation - [1 of 5] will likely whet your appetite on the fact that depression is more than just an appearance of sadness.
My mission here at CorePsych is simple: Use stimulant medications precisely. If they don't work predictably it's highly likely that your body is influencing the way medications are metabolized.
Research indicates that ADHD sufferers are more likely to have sleep abnormalities, a harder time getting to sleep, and a harder time staying awake during the day – especially if we are not being sufficiently stimulated.
I think there is more to it. I think the experience of being in nature resonates in our body and brain as an ultimate kind of coming home–nature coming home to nature.