On a regular working day, Mozart did not sleep long. He started the day with composing from 6 to 9 A.M. Then he did whatever there was to do, until at 8 P.M. he sat down at the clavier or composed until midnight. So only 6 hours of sleep on a regular basis, at least in his Salzburg days, as this schedule comes to us through Nannerl, in a letter written in 1792 to Albert von Mölk, answering questions for Schlichtegroll’s obituary (Briefe vol 4, nr. 1213, p201).
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