I have ongoing daytime drowsiness. I fall asleep while I work and even while I drive. I use my CPap and it works great. It just hasn t helped take care of my daytime drowsiness. I have had my thyroid checked and now I am on thyroid medication. That still hasn t helped my daytime drowsiness. I have difficulty concentrating and this isn t working for me. I need to start college and given my age I just can t be falling asleep all the time.