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In page The Big Sleep (1946 film):

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Principal photography on the film took place on the Warner Bros. backlot from October 10, 1944, to January 12, 1945.[1] Filming was meant to be completed in late November, but was continually delayed due to Bogart's increased drinking. He was in the process of ending his tumultuous marriage to his wife Mayo Methot following his affair with Bacall during To Have and Have Not. As a result of his drinking and abuse from Methot,[citation needed] Bogart was unable to work for several days.[1] When Jack Warner heard that in spite of this the cast was getting along, he sent this ribbing memo: