My sleep is disturbed after a hard or long effort, but I believe that is only because I have a hard time regulating my body temperature (Age 36). I'm usually too hot and can't get comfortable enough to relax. Later on, I tend to cool off and wake up cold. I make an effort to perform my harder efforts earlier in the day(ie, mornings). Saturday mornings can be chilly, but it gives my metabolism a chance to even out before I sleep at night.