Where's the logic in this?

When I left my house today I still had a bit of a migraine left. So instead of biking to work because I thought it I wasn't up to it, I drove the car.

Now, I understand that if I have a cold, I shouldn't ride my bike and driving the car is ok. But when my thinking is impaired by a migraine, which it probably was, I probably shouldn't be driving, right?

Just checking.