The opposite of depression

If depression is possible, of course the opposite is possible. It is all caused by the levels of chemicals in the brain. Interestingly, depression may have been evolutionaryily beneficial by causing sufferers to take less risks, stay indoors (caves) away from wild animals and generally be more realistic (known as depressive realism). The opposite condition, known as mania or hypomania, causes massively increased risk taking; this includes sexually, physically, socially etc and was therefore more likely to cause those genes to be extracted from the gene pool (by that person dying due to their exposure to risk, or being excluded from mating groups).

Sounds kinda like natural selection