A book guaranteed to induce sleep?
The Rabbit Who Wants To Fall Asleep by a Swedish behavioural psychologist and linguist named Carl-Johan Forssén Ehrlin does the trick.

As the parents are even taught how to read it — including indications of places in the story where the peroration should be slow and punctuated with yawns — the most reluctant tot is guaranteed to fall asleep. Perhaps the gentleman can follow it up with similar clever participatory books guaranteed to send all kinds of other pesky people — adults, naturally — into the Land of Nod pronto.
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