Read More:

Scientists map the wiring of the biological clock
eurekalert.org/pub_releases/2013-06/wuis-smt052913.php
"The connections make the clock precise but also let it adjust to changes in day/night cycles."

Night Work May Impair Glucose Tolerance
sciencedaily.com/releases/2013/06/130603114146.htm
"A new study suggests that night work may impair glucose tolerance, supporting a causal role of night work in the increased risk of Type 2 diabetes among shift workers."

Study links workplace daylight exposure to sleep, activity and quality of life
eurekalert.org/pub_releases/2013-06/aaos-slw060213.php
"Enhancing indoor lighting may improve office workers' physical well-being and sleep quality."

Delayed sleep phase disorder
en.wikipedia.org/wiki/Delayed_sleep_phase_syndrome
"Delayed sleep-phase disorder (DSPD), also known as delayed sleep-phase syndrome (DSPS) or delayed sleep-phase type (DSPT), is a circadian rhythm sleep disorder affecting the timing of sleep, peak period of alertness, the core body temperature rhythm, hormonal and other daily rhythms, compared to the general population and relative to societal requirements."

Circadian Rhythms Fact Sheet
nigms.nih.gov/Education/Factsheet_CircadianRhythms.htm
"Circadian rhythms are physical, mental and behavioral changes that follow a roughly 24-hour cycle, responding primarily to light and darkness in an organism's environment."

Inside Life Science: How Our Bodies Keep Time
livescience.com/13123-circadian-rhythms-obesity-diabetes-nih.html
"Even when we're not at work, we're on the clock - our biological clock, that is."


Watch More:

History of Daylight Saving Time:
testtube.com/dnews/dnews-188-why-we-have-daylight-saving-time
How Long Should We Sleep?:
testtube.com/dnews/dnews-257-how-much-sleep-should-we-get
Sand Hates You:
testtube.com/naturehates/sand