Sleeping for 90 minutes at midday boosts the brain's ability to learn
                                
                                
                                    (Newser) -
                                    Taking a nap after lunch helps the brain "reset" and prepare to assimilate new information, researchers say. "It's as though the e-mail inbox in your hippocampus is full and, until you sleep and clear out those fact e-mails, you're not going to receive any more mail," says...