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The zenith, he says, is adolescence, when emotional reactions are further heightened by hormones and changes to the internal body clock which impact sleeping patterns.

She’s mirroring her father and Elsa, who spend their time lounging, cooking, reading, swimming and sleeping.

However, these devices are imperfect in their measurements, and a subset of people become so hyperfocused on them that they actually end up getting stressed out and sleeping worse.

Dr Kirtley said the sound had prevented her from sleeping properly for several weeks, adding: "It's impossible to ignore - it is like somebody shouting in your face constantly for attention."

"So it remains shocking, the wealth of these churches around us and the poverty of the people sleeping on their doorsteps."