听力背景知识50篇：19.Light All Night Not Alright

19. Light All Night Not Alright整夜开灯并非好事 [00:04.33]A nightlight may keep those monsters under the bed. [00:09.16]But it may also open the door to the blues. [00:12.83]If you have access to electricity, [00:15.98]you no doubt switch on a lamp, [00:18.37]maybe even watch a little TV, [00:20.96]after the sun goes down. [00:22.70]But our bodies use cues about lightness and dark [00:26.87]to regulate our hormones [00:29.11]and of course our sleep cycles. [00:31.15]So what might these extra photons be doing to our health? [00:36.03]To find out, scientists housed mice in a room [00:40.00]where the lights were always on. [00:42.23]After three weeks, [00:44.06]they found that mice who lived in the spotlight [00:46.72]showed symptoms of depression, [00:48.87]more so than mice who enjoyed eight hours of darkness at night. [00:52.99]Interestingly, mice who could escape the light [00:56.76]by ducking into a dark tube [00:58.80]also escaped the worst of the depression. [01:01.89]So flip that light switch at your own risk. [01:05.36]Because the artificial brightness that helps keep us up [01:08.88]could also bring us down.