covid-19July 8, 2020 Light pollution ruins teen sleep and may contribute to mental disorders, study says Hey sleepyheads — have you been turning off or covering up all your smartphone and computer lights in your bedroom at night? Related posts U.K.'s Johnson launches mass testing…Do you need a Covid-19…What's behind workers' hesitation to…Fully vaccinated people can travel…Younger Latino men are Covid's…Salmonella infections in eight states…Salmonella infections in eight states…The U.S. isn't losing to…Virus-killing robot tested for use…In Covid fight, Cuba touts…