To Have and Have Not (film) 1944. Bogart and Hawks served as their own technical advisers, because of their experience with fishing and sailing. After filming began, a romance developed between Bogart and Bacall, despite Hawks's disapproval. Bogart was married and at 45 years old, he was more than twice Bacall's age. They kept their relationship a secret from Hawks. This romance eventually led to Bogart divorcing Mayo Methot, his third wife. He and Bacall married a year after "To Have and Have Not" and remained married until Bogart's death in 1957. Hawks expanded Bacall's part to take advantage of the Bogart-Bacall chemistry. According to the
Biphasic and polyphasic sleep one solid block, and he expresses concern that the ways in which the polyphasic sleepers' attempt to limit total sleep time, restrict time spent in the various stages of the sleep cycle, and disrupt their circadian rhythms, will eventually cause them to suffer the same negative effects as those with other forms of sleep deprivation and circadian rhythm sleep disorder. Woźniak further claims to have scanned the blogs of polyphasic sleepers and found that they have to choose an "engaging activity" again and again just to stay awake and that polyphasic sleep does not improve one's learning ability or creativity.