Are you still feeling groggy from changing your clocks ahead for Daylight Saving Time this weekend? Rest assured, it's not all in your head.
It turns out that one hour difference actually does has an impact on our health.
Doctors say if you stray too far from that natural pattern of the day's time, called the circadian rhythm, it will throw your body out of whack. Experts say it could lead to a higher risk of obesity, sleep disorders, diabetes and mental health issues.
And, breaking the natural sleep routine affects performance too.
For instance there is evidence on the books that shows students who have an earlier school start time by just an hour — perform worse academically than students who started an hour later.
We should feel 'caught up' and more rested by the end of the week.