由大林贤史博士领导的研究人员，共招募了863名平均年龄为72岁的老年人。在这一为期两年的研究的初期，这些老人并没有抑郁症状--焦虑或长期的悲伤感。

They measured light levels in their room by placing light meters at the heads of everyone's bed to determine the amount of light their subjects would see while going to sleep.

研究人员测量了这些老人房间的光线水平。他们将测量仪器放在每个人的床头，以判断老人入睡时会看到的光量。

About 710 participants slept in a completely dark room, while the rest of the subjects were exposed to light at night.

大约710人睡在完全黑暗的房间内，而其余的人在夜间会暴露于光线下。

The participants were also asked to keep sleep diaries and completed surveys that monitored the development of depressive symptoms.

研究人员还要求这些老人记睡眠日记，并完成一些调查，以监视他们抑郁症状的发展。

Researchers found that compared to the dark group, people exposed to more than 5 lumens of light at night had a significantly higher risk of developing depressive symptoms.

研究人员发现，同黑暗组的人相比，晚上接触超过5勒克斯的人出现抑郁症状的风险要高得多。

This isn't the first study to link nocturnal light exposure to the mood disorder.

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