[Goanet] Why do we sleep? To clean our brains, say US scientists | Science | theguardian.com

[Con Menezes]

http://www.theguardian.com/science/2013/oct/17/sleep-cleans-our-brains-say-scientists

---
This email is free from viruses and malware because avast! Antivirus protection 
is active.
http://www.avast.com