How many letters does the top answer for “a treatise on sleep; the doctrine of sleep.” have?

The most common answer is hypnology (9 letters).

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Crossword clue: a treatise on sleep; the doctrine of sleep.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

hypnology 9 letters web-def

A treatise on sleep; the doctrine of sleep.

Pattern

the doctrine of nutrition; a treatise on nutrition. 50% similar → threpsology

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)