Last night I went to bed wondering what I might do to be happier. It’s not that I was unhappy about anything in particular, but staying cheerful when winter’s short, dark days arrive is not always easy.

My subconscious mind obligingly answered the question by putting the disco song “You Should Be Dancing,” from the Saturday Night Fever soundtrack, in my head when I woke up.

When I went to do a rowing exercise on the Hydrow machine in the early afternoon, I set it to play disco and funk songs during my 10K row, which took about 48 minutes. “You Should Be Dancing” wasn’t one of the songs, but it definitely did put me in a more cheerful mood!