Just one night of exposure to 100 lux (equivalent to a streetlight shining through a curtain) during sleep impaired glucose tolerance the next morning. It also "increased heart rate and sympathetic [nervous system] activity during the entire sleep period."
This was studied in 20 healthy young adults 18-40 years old, and the moderate-light condition was four 60-watt incandescent overhead ceiling light bulbs (a total of 100 lux).
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