Energy drinks usually makes you more alert and that can relate to sleeps. If you get a decent sleep at night say 7-9 hours, the next morning when you hit the mountain with a nutritional breakfast, you will last much longer on the mountain than those that have lack of sleeps and rely on those high caffeine energy drinks.
Not all of us get to or even like to sleep that long. When I lived in Tahoe I would regularly sleep 1-3 hours and get up first thing to ride, down a coffee or Rock Star Coffee Drink and be good to go.
I also just did a Tough Mudder event without sleeping the night before and my group and I finished in the top 5%. Being able to rally without getting a ton of sleep every single day is part of being a man, and if you're healthy and keep yourself in relatively good shape, it shouldn't be a problem to do so every now and then.
Plenty of water and you are good to go all day long on the mountain.
This is key. I drink a ton of water every day and I feel so much better overall when I am hydrated.
I heard recently that a kid died of drinking those energy drinks.
That kid had a multitude of medical disorders, which is why he died. Studies show that energy drinks are no more harmful for healthy people than your average soda pop. With that said, I don't drink them at all anymore because of the corn syrup, preservatives, and all the other junk that's in them. Regular coffee, water, and green tea are the best energy drinks I've found.