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  • Unusually warm nights can harm human sleep.
    Photo by iStock_rudigobbo.
    Unusually warm nights can harm human sleep.
  • The effect on sleep of warmer than usual nights is most acute during the summer and among lower-income respondents and the elderly.
    Figure courtesy N. Obradovich.
    The effect on sleep of warmer than usual nights is most acute during the summer and among lower-income respondents and the elderly.
  • Areas of the western and northern United States – where nighttime temperatures are projected to increase most – may experience the largest future changes in sleep.
    Figure courtesy N. Obradovich.
    Areas of the western and northern United States – where nighttime temperatures are projected to increase most – may experience the largest future changes in sleep.
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