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Re:Brains Sweep Themselves Clean of Toxins During Sleep (2013) by qiqing on Friday August 14, 2015 @03:30PM (#10062321)
There is some evidence that dreaming is a side effect of defragging the memories of the day into long-term storage format.
Re:Brains Sweep Themselves Clean of Toxins During Sleep (2013) by metasean on Friday August 14, 2015 @03:43PM (#10062416)
There are related learning benefits to sleeping, in particular for materials studied shortly before sleep.

http://healthysleep.med.harvard.edu/healthy/matters/benefits...

http://www.psywww.com/intropsych/ch06_memory/studying_before...