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The key for older people to well at night could be how hot or cold their room . Researchers the best way to get a good night's sleep is to sure the bedroom is between 20-25º Celsius. The researchers are from Harvard University and the Hinda and Arthur Marcus Institute for Aging Research in the USA. They 50 people aged 65 and older to a sleep monitor for a year and a half. The researchers that the quality of sleep when the room temperature was outside the 20-25-degree range. They also that 20ºC was the best temperature. The lead researcher said: "Sleep to come easier and is often deeper and more restful in a cooler environment."

The research full of surprising information. It that temperature could sleep as much as experiencing pain or drinking alcohol before bedtime. The researchers a 5-10 per cent drop in sleep quality when the temperature lower than 20ºC or higher than 25ºC. They said poor sleep can to health issues. These an inability to think clearly, mood swings, and higher levels of stress. Other problems include an increased chance of getting diabetes and cardiovascular diseases. The researchers people should create, "a more comfortable home environment" to well. They also , "the potential impact of climate change on sleep quality in older adults".