Image (IMAGE) University of Tsukuba Caption Researchers from University of Tsukuba have found that exposure to specific types of light before sleep can have variable effects on energy metabolism during sleep. Specifically, participants who went to sleep after exposure to organic light-emitting diodes (OLEDs), which emit polychromatic white light that contains less blue light than light-emitting diodes (LEDs), exhibited significantly decreased energy expenditure, core body temperature, and increased fat oxidation, indicating fewer negative health consequences compared with after nighttime exposure to LEDs. Thus, OLEDs may be a worthwhile alternative to LED lighting, especially for exposure at night. Credit University of Tsukuba Usage Restrictions Unauthorized use is prohibited License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.