Remove any pillows from the bed that are positioners for holding them in place.
Place the person so that they are on their back with their arms at their sides. To do their best they need to be awake and looking comfortable.
Watch while you slowly elevate the head of the bed to 75 degrees. If they start to slide, stop and lower the bed.
Be quiet, watch and do not move.
Ending the Activity
Wait 30 seconds, or if you need to prevent falling to the side, stop the activity.
Is the person still sitting after 30 seconds?