The theory behind light therapy is that it simulates an early dawn and «can jump start circadian rhythms» that
become sluggish during dark, cold months, Rohan said.
For example, for as long as I've worked as a professional I've been aware of the fact that I tend to get
sluggish and less productive for about a half an hour a day at some point normally between 3:00 p.m. and 4:00 p.m. Whatever the cause of this mid-afternoon crash, it
becomes increasingly hard to perform analytical work
during that period and it
becomes increasingly likely that I'll overlook mistakes.