Marguerite Oyelowo reported four hours a night. The diary and the actigraph agreed with each other and disagreed with her by roughly ninety minutes.

The apnoea pathway begins with a home study rather than a laboratory night, which cut the wait for a first result from months to under a fortnight.

Shift patterns cannot be treated around. Where the pattern is the cause, the conversation has to be about the pattern, and it is usually the least welcome conversation in the clinic.

Misperception is a real and treatable finding. It is not the same as being wrong about being exhausted.

Illustrative composite

The diary runs for two weeks before anything is changed. Retrospective estimates of sleep are unreliable in both directions, and the diary is the correction.

“I was still tired,” she says. “But we were treating the right thing, which we hadn’t been.”