"These are tell tale signs that your brain isn't up for the trip:
"Distraction We can't seem to focus on tasks at hand; we absentmindedly flip a switch or turn a know without really thinking abotu what we're doing.
"Muddled thoughts When we've been sick or short of sleep our brain has a tendancy to coast. it seems to struggle with things that we usually don't even have to think about.
"Mental fatigue Your body can feel perfectly fine but, if you've had an intense day, your brain will feel the effects. Its' tired of thinking, and there's generally not much you can do to wake it up. A dose of caffeine isn't the answer, because the burst of energy generally lasts just long enough to get off the ground and into trouble. More importantly, mental fatigue is an insidious theif of your ability to think, and you don't even know it's happening until you start makign obvious mistakes. The basic rule here is to understand that you can't judge your own level of fatigue, It has to be severe to be noticeable. if you have even an inkling that you're mentally fatigued, you're probably far worse than you think you are, and it's time to stay on the ground.
"Emotional interplay Critical areas of your brain are parked about a millimeter from your emotions. You don't have to be very emotionally upset for your thought processes to start paying the price. If you've just been served divorce papers, or theres been a death in your family, or your daughter eloped with that jerk, don't go flying. Emotional distress may be the biggest contributer to distration and no one is immune to its effects.
"Apprehension Don't underestimate the power of apprehension if you are being forced outside of your comfort zone. even though it's necessary to expand your personal envelope over time, there are instances when it's simply smarter to stay on the ground."