You lift the phone to your ear and tell it to "make an appointment in my diary with Kevin at five" or " tell me how the weather looks in London on Friday" and for the most part, it happens.

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You call your guide who asks questions, tells you to keep a food diary for a week, and schedules an appointment with an allergist for the next week.

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Treat your appointment with sleep as being as important as any other in your diary.

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