Sleepy while driving

So normally when I drive I don’t have any problem but when driving to work it is another story. I have around an hours, and hour and ten, drive to work. If I don’t take my medication it is hell. I can drive 5-15 minutes no problem, but then I have to fight my body to keep myself awake. It feels like my eyes are closing against my will and like my mind is fighting against my body to stay awake. Closing my eyes for a second helps but only very short lived. I have never experienced this in any other setting - it is only in the morning when I drive my usual path. If I’m driving somewhere else at the same time, no problem. I can have a very mild version on my way home.

Am I the only one - or what the hell is wrong with my brain?

I would like to point out that I take my medication every morning because I know that what I am experiencing if very dangerous for me and everyone the road - and it would be reckless not to.