By Lauren Fink, ARB Intern, 2011-2012
Though sayings like, “you can sleep when you’re dead,” abound in American, and especially college, culture, sleep is a crucial activity for maintaining health, conserving energy, and learning. During sleep, the body decreases its temperature by about 1-2 degrees Celsius, rests its muscles, rebuilds proteins, and reorganizing synapses. Increased brain activity occurs in the same areas of the brain that were activated by the learning of a new task during the day and correlates with improved performance on the same task the following day.
Humans spend 1/3 of their lives asleep, with about 1/5 of that time in Rapid-Eye-Movement (REM) sleep. A typical nightly sleep cycle occurs in about 90 minutes with a pattern of stages 1-2-3-4-3-2-REM. Though the exact function of REM sleep remains a mystery, it is known that REM deprivation results in increased time spent in REM when no longer REM-deprived. Dreams, which also remain elusive in terms of function, if not meaning, occur mainly during REM sleep but can also occur during other stages. Continue reading