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> (CNN)People around the world are likely to lose 50 to 58 hours of sleep a year by 2099 due to global warming, a new study revealed.Researchers used wristbands with internal accelerometers to measure sleep duration and sleep timing in over 47,000 adults across 68 countries for an average of six months for a study published in the journal One Earth. Adults should get seven to nine hours of sleep, according to the National Sleep Foundation. The likelihood of getting less than seven hours of sleep increased by 3.5% if minimum outside nighttime temperatures exceeded 77 degrees Fahrenheit (25 degrees Celsius) compared with the baseline temperature of 41 to 50 degrees Fahrenheit (5 to 10 degrees Celsius), the study found.To bathe or not to bathe (often). That is the questionThe 3.5% sleep loss may initially look like a small number, but it adds up.