American companies are paying attention to this and are reporting increased levels of alertness in employees who power nap" at some point during the afternoon. if only for 20 minutes. The argument is that those who are not sleep- deprived are much more efficient at work. The used to determine sleep deprivation is called the Multiple sleep test Latency Test, or MSU In a MsLT. an individual remains in a darkened quiet room during the day. According to the theory, sleep deprived the individual is. the the more less time it takes that person to fall asleep. If it takes ten minutes or longer to fall into a light sleep. the participant is probably getting enough sleep: anything less shows moderate sleep deprivation. However, the time of year seems to affect how much sleep an individual requires. People tend to sleep as long as 14 hours in the winter and six hours in summer, without ill effects.