Hidden Bonus of the L Prize: Better Sleep, Better Mood
Posted Oct 05 2009 10:00pm
The Department of Energy has a prize, called the L Prize, for a new light bulb that gives off same light as a 60-watt incandescent bulb but uses much less energy. Philips has submitted what it believes will be the winning entry. For the last decade, I’ve tried to avoid fluorescent lights at night. Ordinary fluorescent lamps emit light with far more blue than incandescent lamps and mess up my circadian-timing system. That systems appears insensitive to incandescent light. Squirrels are like me, a study suggests.
Fluorescent lights are close enough to sunlight to affect our circadian system; incandescent lights, being much cooler than the sun, are invisible to it. The timing of exposure matters if it varies from day to day; exposure to fluorescent lights at varying times is like travelling back and forth across time zones. Everybody grasps that travelling across time zones makes it hard to sleep at the right time; what is less understood is that time-zone-crossing travel affects the depth of sleep because it reduces the amplitude of the circadian oscillation. If you are exposed to fluorescent lights at night now and then, you will sleep less deeply. So I try hard to avoid fluorescent lights at night. I avoid supermarkets and subways, for example.
I discovered all this when I discovered the effects of morning faces on my mood. After I travelled back and forth across time zones, the effect took three weeks to fully return. Nothing else had changed. I conclude that it took three weeks in the same place for my circadian oscillator to return to maximum amplitude. And one evening in which I was exposed to an hour of fluorescent light was enough to get rid of the faces effect for a few weeks. The ubiquity of fluorescent lighting has made it hard to study this effect in other people.
The Department of Energy has a prize, called the L Prize, for a new light bulb that gives off same light as a 60-watt incandescent bulb but uses much less energy. Philips has submitted what it believes will be the winning entry. For the last decade, I’ve tried to avoid fluorescent lights at night. Ordinary fluorescent lamps emit light with far more blue than incandescent lamps and mess up my circadian-timing system. That systems appears insensitive to incandescent light. Squirrels are like me, a study suggests.
Fluorescent lights are close enough to sunlight to affect our circadian system; incandescent lights, being much cooler than the sun, are invisible to it. The timing of exposure matters if it varies from day to day; exposure to fluorescent lights at varying times is like travelling back and forth across time zones. Everybody grasps that travelling across time zones makes it hard to sleep at the right time; what is less understood is that time-zone-crossing travel affects the depth of sleep because it reduces the amplitude of the circadian oscillation. If you are exposed to fluorescent lights at night now and then, you will sleep less deeply. So I try hard to avoid fluorescent lights at night. I avoid supermarkets and subways, for example.
I discovered all this when I discovered the effects of morning faces on my mood. After I travelled back and forth across time zones, the effect took three weeks to fully return. Nothing else had changed. I conclude that it took three weeks in the same place for my circadian oscillator to return to maximum amplitude. And one evening in which I was exposed to an hour of fluorescent light was enough to get rid of the faces effect for a few weeks. The ubiquity of fluorescent lighting has made it hard to study this effect in other people.