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  Industry Dynamic Location: Home >> News >> Industry Dynamic
Lighting Can Affect Whether You Are a Morning or Evening Person
Date: 10/27/2014      Author:      Browse: 0

Have you ever wondered why you always hit the snooze button for an extra 15 to 30 minutes of sleep in the morning? A whitepaper by Royal Philips (NYSE: PHG, AEX: PHIA), the global leader in lighting, has compiled insights from over 10 years of ongoing research1 on the effect of light on our sleep/wake cycle or “circadian rhythm”. It reveals that the amount and quality of light you are exposed to every day may be responsible for your Monday morning blues. Indeed, light ultimately dictates whether you are a morning person or a night owl. 

Lighting, whether natural or artificial, affects all life on our planet. In humans, it plays a crucial role in regulating our circadian rhythm, one of our natural biorhythms or body clock. Our circadian rhythm is not naturally in sync with our artificial clock. Instead it is a little slower running for 24 hours and 30 minutes on average. This means we are naturally inclined to sleep and wake 30 minutes later each day. If this slower rhythm is not regulated then by the end of the week our sleep/wake cycle could be off by more than 2 hours and we would be hitting that snooze button quite frequently. 

A man gets up in the morning. (Photo Credits: Philips)

Regulating Our Circadian Rhythm

Alarm clocks offer one way to manage the time lag created by our naturally slower circadian rhythm. But we have recently discovered that a specific quality of light hitting the photoreceptors in our eyes not only regulates our internal body clock, but can actually reset it every single day. 

For millennia, we like many animals, have used the rising and setting sun to regulate our body clock without realizing it. Today, high intensity artificial blue-rich light is also capable of resetting our body clock because of its qualitative resemblance to natural morning light. As we have a natural tendency to sleep in, our modern 9 to 5 lifestyle means we may be getting too little sleep during the working week and lying in at the weekends. Longer sleep at the weekend may compensate for the lack of rest during the week, but can reset a later circadian rhythm the following week, resulting in that ‘Monday morning blues’ feeling. 

“The message from nature is clear,” says Light and Sleep Scientist at Philips Research, Luc Schlangen. “Our bodies have evolved a kind of steering wheel, constantly adjusting the sleep wake cycle, driven by light, allowing us to adapt to the differing daylight lengths during the seasons. We can help regulate our body clock through lighting by providing light injections at appropriate times, for instance through brighter office lighting on Monday mornings.” 

Exposure to blue-rich morning light can speed up our circadian rhythm to wake us up earlier and improve the daily functioning of people with an early morning lifestyle. 

Lighting Expert Professor Derk Jan Dijk, University of Surrey adds, “Dimming lights a few hours before bedtime facilitates a more rapid onset to sleep and it will prevent your body clock from being shifted to later hours. If you want to shift your clock to earlier hours it is good to be exposed to light and specifically high intensity blue-rich light, when you wake up.” 

Philips dedicates 5% of its Lighting sales revenue to R&D, and is testing and developing a series of energy efficient lighting products for homes, offices, schools and hospital environments that can variously improve alertness, productivity, calm, sleep and mood. 

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