LIGHT THERAPY and DEPRESSION
A study in November 2016 showed that 30 minutes of bright light therapy each morning was highly effective for treating major depression. It was much more effective than both placebo treatment and antidepressant drug therapy.
Bright light therapy lamps like the one used in this study are widely available and definitely worth trying, especially this time of year when circadian rhythms often get disrupted and depression (e.g. seasonal affective disorder, aka SAD) becomes more likely.