Samsung Galaxy S5 turns on when fully charged and never turns off
I am answering my own question, because i somehow solved it. I downloaded the Battery Doctor app (the one featured by Clean Master) and created a scheduled profile for night that has timeout set to 5. Also enabled 'charging screensaver'. It's ok now. Battery doctor takes over the TouchWiz uselsss popups and notifications, and forces it to stand by after 5 secs. It's all OK now :). 

This is the app I am using: https://play.google.com/store/apps/details?id=com.ijinshan.kbatterydoctor_en&amp;hl=en