What selective pressures drive sleep patterns in mammals? Perhaps the most interesting trait that all mammals share is the process known as sleep. Sleep is an essential condition that occurs in mammals and is defined as a naturally recurring state characterized by reduced consciousness and repressed voluntary muscle control. Despite its fundamental role in human and animal life, sleep is, even after decades of scientific research, still quite a mystery in the field of evolutionary science. Why do mammals cease to acquire food and reproduce to subject themselves to such a vulnerable state? This synthesis addresses the question of the origin of sleep in mammals and traces this phenomenon by studying the evolution of the mammalian brain and suggesting possible external factors that affect sleep patterns.
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