Time changes like today's 2am fall back time change can also have numerous other effects other than the workout changing all the various clocks around someone. This short interesting article explains why some of why these supposedly simple time changes may effect more and likely involve more than the average person may be aware of? There's many other articles and information available elsewhere from various sources to reinforce this articles statements and claims.
'Fall back' time change potentially bad for health, experts say - UPI.com
That one-hour time shift -- which occurs at 2 a.m. Sunday -- is more than just a minor annoyance, experts say. Research has shown that deliberately messing with internal clocks twice a year increases risks to health.
www.upi.com