dice form the words 'serotonin' and 'melatonin.

'melatonin 'serotonin' antidepressant antidepressants biology brain care chemical chemistry concept cortisol cube cycle daily depression dice disease drug emotion form happiness happy health hormonal hormone insomnia lifestyle medical melatonin mental mentality mind monoamine mood night psychological psychology research rhythm routine schedule science scientific seratonin serotonergic serotonin sleep spiritual stress supplement symbol therapy word words