Vibration during "do not disturb" Android Marshmallow

[AC Question]

Hello,
I'm on a Samsung Galaxy S7 and after googling and fiddling with my phone have not come up with a solution.
During the night in "Do not disturb" mode the phone continues to vibrate for incoming messages and alerts.
I tried just about everything including :
- setting up a personal setting only allowing emergency calls
- only alarms

The only thing I didn't try is NO exceptions as if my family has an emergency.

BTW there were no vibration notifications until I installed Airdroid yesterday. Maybe that is the culprit.

Thank you in advance for your answers.

 

[dpham00]

Mod Note, I will move this to the s7 forum for more visibility