I'm 30; it's not aches and pains, just feeling super overheated and restless.

I do a "stretching" class based on yoga at work, but I have to be careful with real yoga -- all that downward dog does bad things to my wrist. I could attend the class at the climbing gym. I do love shivasina (sp?) But I adore any activity that forces me to be 100% in the moment, like climbing and mountain biking. I'm "in my head" too much, and I need to counterbalance that tendency with activities that require absolute concentration.

I usually climb over lunch, and I don't think it really keeps me up ... but maybe ... I think it's more stuff like biking, endurance stuff, that causes the overnight overheating and restlessness.