DTetzDepression may be solved by quality sleep, not too much and not to little. There is a J shaped curve which reflects optimal results and that peak lies at 8 hours of quality sleep. Sleep quality is not the same as sleep opportunity. Sleep opportunity is how much time you spent in bed "trying to sleep." Quality would start when you actually fall asleep, not just when you close your eyes.
I believe the vast majority of ADHD, depression, mood swings, and general feelings of "un-wellness" stem from inadequate sleep.
I dunno why you're being downvoted so much cause sleep is 100% a major factor in mental health/ physical health. Its when the body can recharge/ revitalize itself through rest. People with atypical natural and unnatural sleep cycles tend to get punished when they're forced to conform to other ones. Getting enough rest/quality sleep isn't a "cure" so to speak but in terms of lessening symptoms/ effects, it can be some of the best medicine.
In my experience, mental health seems to be a combination of exercise, purpose, community, sleep, diet and discipline. Pills and therapy can absolutely help and some people need help defining their issues/ dealing with trauma and are a necessary step when categorizing the issue/thought patterns/ etc. At some point you'll have a plan where its necessary for the person to understand and want to put in the effort to get better while they hopefully have their needs met and support for when there are setbacks.
I feel like we've come to a crossroads in mental health where there's a recognition that the blame for can lie with structural and societal issues while at the same time its on the individual to make themselves better. Especially in America, individualism has lead to a degradation of community support which makes the deal feel even worse. Polarization politically makes it feel like you have to pick either society is at fault (goddamn libs whining) or that its the weak individual who can't pull themselves together (make america great again).