According to new research, even a little light in the evening can have a large effect on your body clock
) in the hypothalamus of the brain. When it's dark, the retinal ganglion cells contact the SCN, which then tells the nearby 'pineal gland' to release melatonin into the bloodstream -- broadcasting a signal throughout the body that it's time to sleep. The SCN is the body's 'master clock', synchronized by light, and can be thrown out of sync by artificial illumination created by indoor lighting at night.
The new study by scientists at Monash University in Australia has now revealed how exposure to evening light disrupts circadian rhythms. After putting 55 young people in less than 1 lux , the researchers exposed participants to a range from 10 lux to 2000 lux . They found that melatonin levels were suppressed by half -- making people more awake -- at 25 lux, or roughly equivalent to the amount of indoor lighting used at night, which delayed an increase in melatonin by about 1 hour.
Their results also showed the differences in sensitivity among individuals: one person experienced 50% melatonin suppression at just 6 lux, whereas the least-sensitive participant didn't feel the effects until exposure to 350 lux. This suggests that sensitivity to light doesn't have the same impact on everyone's body clocks, which can in turn affect our health.
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