MSGID: 1:317/3 645334e3   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    How is sleep affected by changing clocks and seasons?    
    Study finds problems only when getting an extra hour of sleep    
      
     Date:   
         May 3, 2023   
     Source:   
         American Academy of Neurology   
     Summary:   
         How are you sleeping? A new study has found the transition from   
         daylight saving time to standard time, when one hour is gained   
         overnight, was associated with a brief increase in sleep disorders   
         such as difficulty going to sleep or staying asleep, but there   
         was no such association when an hour is lost in the change from   
         standard time to daylight saving time.   
      
         The study also found a small difference in the amount of sleep   
         people get depending on the season.   
      
      
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   FULL STORY   
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   How are you sleeping? A new study has found the transition from daylight   
   saving time to standard time, when one hour is gained overnight, was   
   associated with a brief increase in sleep disorders such as difficulty   
   going to sleep or staying asleep, but there was no such association   
   when an hour is lost in the change from standard time to daylight   
   saving time. The study is published in the May 3, 2023, online issue of   
   Neurology(R), the medical journal of the American Academy of Neurology.It   
   also found a small difference in the amount of sleep people get depending   
   on the season.   
      
   "Sleep plays an essential role in maintaining good health, mood,   
   cognition, job performance, and social activity, and it is influenced by   
   the circadian rhythm, the internal clock that regulates body processes,"   
   said study author Ron B.   
      
   Postuma, MD, MSc, of McGill University, in Montreal, Canada, and a member   
   of the American Academy of Neurology. "The good news is that the sleep   
   disruptions we observed following the change to standard time were brief   
   and no longer evident two weeks after the shift."  The study involved   
   30,097 people, ages 45 to 85, who completed a questionnaire about sleep   
   duration and satisfaction, ability to fall asleep, ability to remain   
   asleep and excessive sleepiness during the day. Questions included,   
   "Over the last month, how often did it take you more than 30 minutes to   
   fall asleep?" and "Over the last month, how often did you wake in the   
   middle of the night or too early in the morning and found it difficult   
   to fall asleep again?"  Those who responded three or more times a week   
   to either of these questions were considered to have sleep problems.   
      
   For the change to standard time in the fall, researchers compared   
   people who completed the questionnaire one week before the transition to   
   those who completed it one week after. After adjusting for age, sex and   
   location, they found those who completed the survey one week after the   
   transition had a 34% increased risk of sleep dissatisfaction, with 28%   
   reporting sleep dissatisfaction compared to 23% of those interviewed one   
   week before. Those who completed the questionnaire one week after also   
   had a more than two times greater risk of difficulty falling asleep,   
   a 64% increased risk of difficulty remaining asleep, and a two times   
   greater risk of excessive sleepiness during waking hours.   
      
   For the transition to daylight saving time in spring, researchers compared   
   people who completed the questionnaire one week before the change to   
   those who completed it one week after. They found no difference in   
   sleep problems.   
      
   However, they did find a nine-minute decrease in sleep duration one week   
   after this transition.   
      
   Researchers looked at when participants completed the questionnaire:   
   spring, summer, fall or winter. While they found no difference for sleep   
   problems, they did find a small difference in sleep duration.   
      
   People who completed the questionnaire in summer had the shortest sleep   
   duration, an average of 6.76 hours of sleep daily. People who completed   
   the survey in the winter had the longest sleep duration, an average of   
   6.84 hours of sleep daily, a difference of five minutes.   
      
   "As disruptive as these transitions may feel in the short term, there   
   may be few long-term implications of the repeated switch back and forth   
   from daylight saving time to standard time." said Postuma. "However,   
   previous research has linked the transitions to and from daylight saving   
   time with higher rates of accidents as well as an increased risk of stroke   
   and heart attack. Future studies are needed that follow individuals over   
   time, including people living in areas with different light exposure   
   and seasonal changes."  A limitation of the study was that it included   
   only middle-aged and older adults, and results may not be the same for   
   younger adults.   
      
   The study was funded by the Canadian Institute for Health Research.   
      
       * RELATED_TOPICS   
             o Mind_&_Brain   
                   # Sleep_Disorders # Insomnia # Obstructive_Sleep_Apnea #   
                   Disorders_and_Syndromes # Child_Development # Parenting #   
                   Behavior # Perception   
       * RELATED_TERMS   
             o Delayed_sleep_phase_syndrome o Circadian_rhythm_sleep_disorder   
             o Narcolepsy_(sleep_disorder) o Sleep_deprivation o Insomnia   
             o Sleep_disorder o Night_terror o Sleep   
      
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   Story Source: Materials provided by American_Academy_of_Neurology. Note:   
   Content may be edited for style and length.   
      
      
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   Journal Reference:   
      1. Sheida Zolfaghari, Marie`ve Cyr, Ame'lie Pelletier, Ronald   
      B. Postuma.   
      
         Effects of Season and Daylight Savings Time Shifts on Sleep   
         Symptoms: Canadian Longitudinal Study on Aging. Neurology, 2023;   
         10.1212/ WNL.0000000000207342 DOI: 10.1212/WNL.0000000000207342   
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   Link to news story:   
   https://www.sciencedaily.com/releases/2023/05/230503200454.htm   
      
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