How do I stop my note 4 from activating the screen when it is done charging? When I charge it at night and its finished the screen will stay on all night unless I plug it out. How do I stop this from happening.
Do you have the Developer Options settings enabled on your phone? If you do, go to Settings >> Developer Options >> Stay Awake. If that option is checked, then your phone will never sleep while charging. Uncheck it.

Also, in Settings >> Display >> Daydream >> When to Activate (at bottom),do  you have Daydream set to activate while charging? It's possible Daydream is triggering.