You will have noticed the drop. Less in you by the afternoon, a reluctance about the evening, the sense that the year has stopped offering and started asking. And somewhere underneath, the familiar suspicion that other people are managing this better than you are.

There is an old calendar that would not have found any of that surprising.

In the Gaelic tradition the year had two halves rather than four seasons, with four festivals marking the quarters. The light half ran from Bealtaine in May to Samhain in November, and the dark half ran back round to May. This Saturday night and Sunday are where the old line falls.

Some care with the detail, because this material attracts invention. Medieval Irish sources attest Samhain as a major festival marking the turn. Much of what gets attached to it, including the confident business about ancient Celtic new year rites, was assembled in the nineteenth and twentieth centuries by enthusiasts with more imagination than evidence. In broad terms the two halves are solid. The elaborations are decoration.

The structure is what matters. The year contained a season in which less happens. Not a failure of the year. A half of it. Cattle came down, stores were counted, the work changed character, and nobody expected February to produce what June did.

Set that against the calendar you live in. Ours has no dark half. The working year runs flat, the targets do not change, and the one concession, Christmas, demands the heaviest output of the year in the darkest weeks, followed by a January in which everyone is supposed to reinvent themselves.

So when your capacity drops in November, there is no slot for it. It lands on you as evidence, read as a personal failing rather than a season.

For a body already rationing, this is a second tax. You manage the illness, and also a calendar that pretends winter is not happening. The first is unavoidable. The second was built by somebody else.

One caution before the practice. If the drop is severe, if you cannot function, or the darkness has come with hopelessness rather than heaviness, that is not a season to plan around. That is worth a doctor, because it is treatable.

For the ordinary version, the one that arrives every year and surprises you every year, the question is a planning one:

Today’s Practice

Half an hour with a calendar, and most of it is subtraction.

On a hard day, write the dates down and leave the rest. And the boundary: if what arrives this year is flatness that will not lift, or thoughts that you would rather not be here, that is a conversation today. Your doctor, or Samaritans on 116 123 in the UK, 988 in the US. In immediate danger, call 999 (911 in the US).

What the Research Says

The research is less tidy than the magazines suggest. Seasonal low mood appears in the manuals as a pattern rather than a separate illness. How common it is remains contested. Some large studies found no seasonal pattern in mood scores, which keeps the field arguing. The defensible reading: a minority have a true seasonal pattern, many more notice a mild dip. Depression is also commoner alongside long term illness, and winter can worsen physical symptoms. If it lifts with light and routine, that tells you something. If it does not, that is information rather than failure.

Everyone’s Talking About

The productivity calendar is about to make its annual demand, and it is worth seeing it coming. The fourth quarter push, the finish the year strong genre, the goal setting that begins in December so that January can start at a sprint. All of it lands in the eight darkest weeks. Nothing about that schedule comes from the body, and a great deal of it comes from accounting. You are permitted to notice that the plan was written for a quarter rather than for a person, and to run a different one.

From the Old World

Japanese poetry has a word for this and treats it as a condition of the season rather than a complaint. Fuyugomori means winter seclusion, the shutting in that the cold produces, and it is a recognised season word in haiku, with centuries of poems behind it. That is the part worth taking. In that tradition, withdrawing indoors for months is not evidence of anything about your character. It is a thing winter does to people, reliable enough to have its own vocabulary and its own poems.

Come Home

Five lines, for the dark half of the year.

One act for today, or smaller still. Write down the months between this weekend and February, and look at them as one stretch rather than four separate disappointments.

The old calendar gave this half a name and then let people live in it. Ours gave it a target. You are allowed to keep the name and ignore the target.

P.S. Tomorrow, sixty seconds, and it happens at a window before the light goes. The smallest possible observance of the dark half.