I have normally turned on the auto-rotate screen feature from Android. When I wake up by the alarm and I’m in the bed I turned on to do a little bit maths with sleep as Android. Here my problem begins. 
The screens is always turning to an upright position, but I’m in bed, so my head is in horizontal potion. That’s to much for me. 
So I have to stop auto-rotate screen first and then I can stop my alarm.
It would be great if Sleep as Android could be in Portrait mode only, also when the auto-rotate feature in Android is turned on.