The Big Sleep (1946 film) war. Bacall's agent, Charles K. Feldman, asked that portions of the film be re-shot to capitalize on their chemistry and counteract the negative press Bacall had received for her 1945 performance in "Confidential Agent" which was released prior to "The Big Sleep" even though produced after it. Producer Jack L. Warner agreed, and new scenes for "The Big Sleep", such as the sexually suggestive racehorse dialogue, were added (scripted by an uncredited Julius Epstein). The re-shot ending featured Peggy Knudsen as Mona Mars because Pat Clark, the originally cast actress, was unavailable. Furthermore, the parts of James Flavin and Thomas
Sleep and memory actually become worse at the task. The individuals that were allowed a 30-60 minute nap seemed to gain stabilization of the skill as no deterioration occurred. If allowed a 60-90 minute nap (REM sleep and slow-wave sleep), individuals displayed enhancement. Unlike the motor task, enhancement was not suppressed during the nocturnal sleep if the individual had napped earlier. In the situation of visual skill learning, naps have been shown to prevent wakeful deterioration and even enhance learning above and beyond enhancement occurring in nocturnal sleep. Shift workers who work throughout the night have been known to have far more accidents