So I went into the advanced wi-fi settings and set the wi-fi to NEVER stay on during sleep. Then I went back to my home screen and tapped the power button to put it to sleep. The wi-fi should have disconnected. Then I tested it by sending it an email from another computer. I should NOT have received it because the wi-fi should be off when it is asleep. But I still got/heard the email notification while it is sleeping indicating the wi-fi is on. Even after 15 minutes of being "asleep". Can someone else please try this to verify that their wi-fi is shutting down during sleep (if it is set to do so in wi-fi advance settings). Thanks ahead of time!