Predation is a strong selective agent when it comes to the sleep activity of mammals. If a particular mammal is found in an environment where predators are abundant, then this setting should select for individuals in the population with the shortest sleep period because they would be the least vulnerable. Therefore, it can be speculated that increased levels of predation in the environment selects for mammals with shorter sleep period.
It is Sanford and othersâ€™ contention that mammals in vulnerable settings experience less intense sleep states. In a shock therapy experiment, mice were subject to constant electrical stimulation over a period of time. Although electrical shock is not the same as predation, the stimulating significance is very similar. Results found that mice subject to higher frequencies of stimulation spent significantly less time in NREM sleep states.
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