With enough sleep and every possible method i know, i have found myself nodding off behind the wheel. my family is worried. i know it's dangerous.

Blood work: I would have a CBC with diff, ferritin and iron level, thyroid test, cortisol level. Also, I would have them check your liver enzymes. If that all comes back normal, you will need a sleep study to make certain that you do not have a parasomnia. That is a condition in which you're not getting an efficient amount of sleep, despite you falling asleep. Sleep apnea does this as well.