I can understand how annoying this problem could be. I keep my Note 4 plugged in all night but I don't get that white pop up notification on my lock screen. Only my LED light changes to solid green, which also is annoying. The old Blocking Mode used to stop the LED from lighting up at night. I wonder if your problem has anything to do with using wireless charging? Anyway, here's something that might help. Long press on the pop up notification until you get the little info button. Press on that and in the app info screen uncheck the box that says Show Notifications for that app.
loo G.