 Nobody is immune to fatigue if they haven't had enough sleep. So it doesn't matter where you operate in a vehicle or what time of day, fatigue can affect anyone. The misconceptions people think that will improve the feeling of fatigue or tiredness is winding down the window, having cool air on their face, turning the radio up or having coffee, things like that. If anything, those signs that you're winding down the window because you're feeling drowsy or fatigued or tired shows you're ignoring those signs. If your body is not getting enough sleep or broken sleep over a number of nights that will accumulate and the accumulation of that lack of sleep is dangerous. The only way to rectify sleepiness is with sleep.