An Associated Press article on pbs.org explains seasonal affective disorder, a depression that typically begins in fall and eases in spring, first described in 1984 by Dr. Norman Rosenthal's NIH team. It reports that light therapy — about 10,000 lux for 30 minutes each morning — and antidepressants are first-line treatments, while researchers Kelly Rohan and Paul Desan say cognitive behavioral therapy and even outdoor walks on cloudy days can help.