Looking at my data usage online, it is saying that every night at really strange times (like 3am) my iPhone 5s is using data. How can this be if I'm clearly sleeping and not using my phone and my phone is constantly on WIFI at that time of night anyways? Some are very small but others range to 10mb which is crazy! I reset my stats in my settings to see if any apps were to blame and they aren't, so it must be something running in the settings or something I'd guess. Any ideas?