The gene that decides what bad sleep costs your brain

The brain's overnight cleaning system is not equally efficient in everyone. One gene appears to set the price of a short night.

It is easier to describe what changed than to say when. Everyone involved gives a different starting date, and all of them are defensible.

Read against the previous five years, the shift is not dramatic. Read against the assumptions in the planning documents, it is the whole ballgame.

How it started

The pattern held across every place we checked, which is usually a sign that the cause is structural rather than local. Where it broke down, it broke down for reasons that were specific, documented and — in retrospect — predictable.

“We didn't lose capacity overnight. We lost it one reasonable decision at a time.”

What changed on the ground

People adapted the way people always do: informally, quickly, and without a budget line. Staff rewrote their own protocols, called colleagues in other districts, and kept a shared spreadsheet that outperformed the official dashboard for six weeks.

That improvisation worked, which is both the good news and the problem. A system that survives on goodwill is not resilient; it is borrowing against people who cannot keep lending.

What happens next

Two reviews are open and one timeline has been published. The measures under discussion are unremarkable — buffers, second sources, mandatory notice periods — which is usually a sign that the fix is known and the will is the variable.

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