. Biologically, humans are "preprogrammed" to have one major sleep cycle at night and another short one in mid-afternoon. In some cultures, a Siesta is the norm, while in other cultures, people are expected to remain awake all day. Other cultures may emphasize practices that lead to sleep deprivation, such as working long hours, socializing until late at night, and getting up early in the morning. What attitudes does your culture have toward sleep?