The results of our study on the effects of near-infrared light (NIR) on health and well-being in people suffering from sleep loss is published today. In a double-blind, randomized, placebo-controlled study, the effects of three NIR light (850 nm) doses (1, 4, or 6.5 J·cm−2) were examined against the placebo. Exposure was presented five days…
“Artificial light in most offices and homes undermines performance, well-being and health; it’s time for change and that starts with a new awareness,” says Marijke Gordijn in an article in the LED Magazine of June 2021. Marijke Gordijn has been arguing for the right light at the right time for years. Read the whole article…
On January 8th, Marijke Gordijn from Chrono@Work and Roelof Hut from the University of Groningen were interviewed by EditieNL about the effects of the COVID-19 related restrictions on sleep. Colleagues recently published that on average people sleep longer and later during the lockdown. However, shortage of sleep and sleeping problems have serious health effects. EditieNL…
The Dutch media are highly interested in the new teaching package Charge Your Brainzzz. Please read the item “50% of the adolescents do not sleep enough…but in this way you will get them in bed” (in Dutch) that RTL published online on September 27th.
Van der Heijden, K.B., Vermeulen M.C.M., Donjacour, C., Gordijn M., Hamburger, H., Meijer, A.M., Van Rijn, K. Chronic sleep reduction predicts academic achievement and study concentration in higher education students. J. Sleep Res. 2017
http://onlinelibrary.wiley.com/doi/10.1111/jsr.12596/abstract
On September 12 several media reported that according to a TNS Nipo survey among 3,400 Dutch, that one out of six workers has sleeping problems. In a radio interview with Radio North on September 12 at 13: 40h Marijke Gordijn CEO of Chrono@Work explained what the risks are of sleep deprivation (http://radio.rtvnoord.nl/ipad/index.asp?actie=radiogemist). We should distinguish…
In their issue No. 19 of 23 August – 6 september, Computer Idee, a magazine about computers and electronics for consumers, pays detailed attention to the pros and cons of blue light filters for computers, tablets and smartphones. The conclusion is that we are exposed to more blue light through the use of electronic screens…
LIght therapy to shift the biological clock has been shown to be effective, but in most cases studies are carried out in well controlled laboratory studies and with long duration light pulses. In practice, light therapy should consist of an easy to apply lighting regime to which people at home will adhere and with clear…
Apple recently released a free update to iOS 9.3, the operating system for iPhone and iPad. The most interesting addition this time is the ‘night shift’ function. After sunset, the screen gets a rosy glow that is less bothersome to the eyes and should ensure a better night’s sleep. In the Dagblad van het Noorden…
A new photometric measure of light intensity that takes into account the relatively large contribution of the ipRGCs to the non-image forming (NIF) system was recently proposed. We set out to revise publications reporting on alertness scores as measured by the Karolinska Sleepiness Scale (KSS) under different light conditions in order to assess the extendibility…
Light is an important environmental stimulus for the entrainment of the circadian clock and for increasing alertness. The intrinsically photosensitive ganglion cells in the retina play an important role in transferring this light information to the circadian system and they are elicited in particular by short-wavelength light. Exposure to short wavelengths is reduced, for instance, in elderly…
