Would you exercise on no sleep? I very much want to try out the gym at my school, and I've made plans with a friend to go together tomorrow afternoon. She won't go alone, so if I don't go she will be mad she brought her things. But it's about 5am and I've been tossing and turning all night, and I need to be up in an hour and 45min, and I doubt I'll sleep at all. My heart is beating quite fast & I can't relax. I don't want to let my friend down, and I also want to finally get to the school gym that's intimidated me alone. But I don't want to injure myself or do something dangerous. What would you do?