Circadian Rhythm Affects Memory

Most people become aware of their internal circadian clock when they cross several time zones and experience jet lag, but scientists have known for decades that the rhythm of the internal human clock regulates almost every biological system.

Now researchers at Stanford University have shown that when the circadian system breaks down, so does memory. In a paper published in the Proceedings of the National Academy of Sciences, biologist Norman Ruby found that hamsters with disabled circadian systems were, unlike "normal" hamsters, unable to remember their environment.

Source: http://news.yahoo.com/s/livescience/circadianrhythmaffectsmemory