I feel healthy, joyful, and vibrant.

There's a stretch in most years — late winter, usually — when everything feels slightly heavier and nobody can say why. Then the light changes in March and people start mentioning that they feel like themselves again.

Feeling well isn't purely a matter of attitude, and that is good news rather than bad. It has inputs: sleep, daylight, movement, food that wasn't designed in a laboratory.

None of it is glamorous and all of it is available. The mood tends to arrive about three days behind the habits, which is why the habits so rarely get the credit.