Rhythmic Human

A Blog Around The Clock

Category archives for Rhythmic Human

Adolescent Sleep Schedule

This kind of ignorant bleating makes me froth at the mouth every time – I guess it is because this is my own blogging “turf”. One of the recurring themes of my blog is the disdain I have for people who equate sleep with laziness out of their Puritan core of understanding of the world,…

My regular readers are probably aware that the topic of adolescent sleep and the issue of starting times of schools are some of my favourite subjects for a variety of reasons: I am a chronobiologist, I am an extreme “owl” (hence the name of this blog), I am a parent of developing extreme “owls”, I…

‘Insomnia: A Cultural History’

Book excerpt in today’s Wall Street Journal: Chapter 6: Wired: It is likely that insomnia will increase with the expansion of the 24-hour economy into more and more lives, and more of each life, because wakefulness and the wired world go together. The more interconnected we are, the more we communicate, and the more we…

Shift Work May Be Cancer Risk: In an announcement to be published Saturday in the journal Lancet Oncology, the International Agency for Research on Cancer, part of the World Health Organization, will label shift work as a “probable cause” of cancer. The designation — rooted in the theory that the disruption of circadian rhythms could…

I am sure I have ranted about the negative effects of DST here and back on Circadiana, but the latest study – The Human Circadian Clock’s Seasonal Adjustment Is Disrupted by Daylight Saving Time (pdf) (press releases: ScienceDaily, EurekAlert) by Thomas Kantermann, Myriam Juda, Martha Merrow and Till Roenneberg shows that the effects are much…

Anyone going to this?

Symposium Light, Performance and Quality of Life is on Thursday, 8 November 2007 in Eindhoven, the Netherlands: Introduction The ancient Greek already referred to the wholesome effects of the (sun)light on mankind. Ever since the industrialization, more and more people are devoid of bright daylight for a large part of the day. With the ongoing…

Yes, delay the school starting times

From the Independent: The head has identified research which says that teenagers would be more likely to take in what they are learning if they started school two hours later. He is considering changing the school timetable for sixth-formers as a result. “We have always assumed that learning early in the morning is best, probably…

Phase-Response Curves to Melatonin

NBM found an excellent online article (which I have seen before but I forgot) depicting Phase-Response Curves (PRC) to injections of melatonin in humans, rodents and lizards. Note how the shape is roughly opposite to that of a PRC to light pulses, i.e., at phases at which light elicits phase-delays, melatonin produces advances and vice…

Are you SAD?

Why are Orli and Joseph thinking about this in the middle of the summer? I am happy (and South enough). I am wondering if people with SAD living in the high latitudes either moved South or, being all gloomy, had a lower reproductive rate in the past, thus lowering the rates of SAD in the…

The Amplitude Problem

If you are one of the few of my readers who actually slogged through my Clock Tutorials, especially the difficult series on Entrainment and Phase Response Curves, you got to appreciate the usefulness of the oscillator theory from physics in its application to the study of biological clocks. Use of physics models in the study…