“light enough to see across” at night.However，they say there is not enough evidence to advise people to buy thicker curtains or turn off lights.

　　The women were asked to rate the amount of light in their bedrooms at night as：Light enough to read.Light enough to see across the room，but not read.Light enough to see your hand in front of you，but not across the room.Too dark to see your hand or you wear a mask.Their answers were compared to several measures (程度) of obesity.These measures were all higher in women with lighter rooms.

　　Prof Anthony Swerdlow of the Institute of Cancer Research told the BBC：“In this very large group of people there is an association between reported light exposure at night and overweight and obesity.But there is not enough evidence to know if making your room darker would make any difference to your weight.There might be other explanations for the association，but the findings are interesting enough to guarantee further scientific investigation.”

　　The light is disrupting (干扰) the body clock，which comes from our evolutionary (进化的) past when we were active when it was light in the day and resting when it was dark at night.Light changes moods，physical strength and even the way we process food in a 24­hour cycle.

　　Prof Derk­Jan Dijk，from the Surrey Sleep Centre，said there would be no harm in trying to make bedrooms darker.He told the BBC：“People in general are not aware of the light present in their bedroom，I think people should assess their bedroom and see how easy it would be to make it darker.” “Overall this study points to the importance of darkness，” he concluded.

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