The drama of life begins with a wail and ends with a sigh.
Regular exercise reduces stress and anxiety, and generally improves sleep. But for some people, exercising within a few hours of bedtime may cause problems getting to sleep. Keep in mind, everyone’s different. For some people, late-day exercise isn’t a problem.
source: http://www.mayoclinic.org/healthy-lifestyle/fitness/expert-answers/exercise/faq-20058462