I have the same issue, first don't drive. Secondly see your primary and discuss this, they might send you for testing or even give you meds to keep you awake. If you have any illness (I have pots) that can cause this exhaustion due to needing more energy to do a simple task. If you want advice to help keep you awake a bit, I would suggest if your able to maybe do yoga or go on a walk. When I am feeling like this, a bit of stretching or exercise helps me wake up for a few minutes.

I had this back when i had chronic fatigue. I even heard myself snore one time. My friend has narcolepsy and she would fall asleep so quickly thatbit was hard to tell. She did not hear us during that time.