It seemed so straightforward when Helen explained it yesterday.

I’m to wear this watch-type thing which tells me the time – so, in fact, a watch – but it also collects data about sleep patterns. A bit like my FitBit but much clunkier, less useful and a horrid institutional grey. I’m to wear it continuously for two weeks, day and night, and then send it back in the prepaid Jiffy bag together with the sleep diary. In a year’s time, they’ll call me back and I’ll do it again.

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