With Android tablets, while the tablet is in sleep mode, I have had issues with the battery draining significantly due to the WiFi being on. As a result, I have had to go through the trouble of turning off WiFi whenever I put the tablet to sleep. With an iPad, there seems to be very little battery drain in sleep mode, even with the WiFi on. Will I get any benefit from turning the WiFi off when I put the iPad to sleep? Thanks.