Chronobiology: An Internal Clock for All Seasons (part 2)
Current Research on Seasonal Affective Disorder and Phototherapy

Chronobiology An Internal Clock for All Seasons (part 1)
This essay (the first of two parts) discusses chronobiology, the study of these biological clocks. Biological periodicities may range from ultradian and circadian to circahmar and circasrnualcycles

Body's biological clock found to affect cardiac rhythm patterns in healthy adults
Statistical physics approach to analysis of heartbeat pattern uncovers link to circadian cycle

The body's biological clock: alcohol may lead to physiological anarchy
Circadian rhythms refer to biological phenomena that oscillate within a 24-hour cycle, in keeping with the earth's rotation.

The science of lost sleep in teens
Studies by Brown, Lifespan scientists are at cutting edge of sleep research

Negative effects of caffeine are stronger on daytime sleep than on nocturnal sleep
A study has concluded that people drinking coffee to get through a night shift or a night of studying will strongly hurt their recovery sleep the next day.

Jefferson and Brigham and Women's researchers find blue light important for setting biological clock
Researchers have found that the body's natural biological clock is more sensitive to shorter wavelength blue light than it is to the longer wavelength green light, which is needed to see.

Health in a 24-hour society
The increasing demand of many societies for people to work outside office hours could have negative influences on health, legal, and economic outcomes

Siestas in space?
Brief naps may prevent the effects of chronic sleep loss experienced by astronauts during missions.

Night eating and obesity in the EP3R-deficient mouse
EP3R–/– mice exhibit an obese phenotype with a "night" eating component that is demonstrated by increased feeding during the light cycle of the day.

Chronopharmacology Focused on Biological Clock
The author introduce the regulatory system of biological rhythm from viewpoints of clock genes and the possibility of pharmacotherapy based on clock genes.

Inducible and Reversible Clock Gene Expression in Brain Using the tTA System for the Study of Circadian Behavior
CLOCK protein is an excellent indicator for the kinetics of Dox-dependent induction/repression in the brain.

Nighttime is the right time to prevent preterm labor with aspirin
Low-dose aspirin prevented preterm labor in pregnant women at risk for high blood pressure, but only if they started therapy before the 16th week of pregnancy, and only if they took it at night..

Lack of sleep can affect athletic performance in teens
Adolescents who don't get enough sleep might be jeopardizing their athletic performance, and high school sports teams on the west coast may be at a disadvantage if they play east coast rivals..

Scents will not rouse us from slumber, says new Brown University study
While sound can disrupt sleep, scents cannot.

Overly tired teen? Sleepiness may signal serious health problem
Adolescents who are lethargic, cranky and forgetful may have a common ailment: chronic sleep deprivation.

Timing of women's labor may determine effectiveness of pain medication
The study found that women who had day labor got longer pain relief than women with night labor with the same amount of labor pain medicine.

what is circadian rhythms? circadian rhythms and depression?causes? prevention?
There are some people who feel that the main thing behind depression is an upset of the body’s circadian rhythms.

As different as night and day
In biology, sunlight is just one distinction between night and day.

Defective Awakening Response to Nocturnal Hypoglycemia in Patients with Type 1 Diabetes Mellitus
Results show that awakening during hypoglycemia was associated with substantial hormonal changes, and the increases in this hormone occurred before polysomnographic signs of wakefulness.