lack of sleep + heat + driving = bad combination

Today I had to drive for like half an hour and I felt soooooooo sleepy. My trips are usually around that length but today, the fact that I couldn't take a proper 9ish nap, plus no 2ish nap and the heat that was driving me insane, I was almost to the point of falling asleep behind the wheel. This is, of course, not safe. But I blame it mostly on the heat. If I start seeing a pattern, I might reconsider this whole sleeping thing for the sake of safety.