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A new study of older adults has found too much daytime napping (may signalan increasing risk of Alzheimer's disease.Researchers from Brigham and Women'sHospital have reported the relationship between the two:too much daytime nappingpredicts an increased future risk of Alzheimer's,and a diagnosis of Alzheimer's speedsup the increase in daytime napping during aging."Daytime sleep behaviors of older adults are often ignored,and an agreement fordaytime napping in clinical practice and health care is still lacking,"said Peng Li,one ofthe researchers."Our team calls for a closer attention to 24-hour sleep patterns-notonly nighttime sleep but also daytime nap-for tracking the health of older adults."The researchers recognized that all previous studies on Alzheimer's disease assessednapping within a participant only once,and most of which were subjective andquestionnaire-based.In the new study,more than 1000 individuals,with an average ageof 81,were provided Actical,a watch-like device,to wear on their wrist for up to 14 days.After napping episodes were identified,the nap duration and frequency were calculated.The results have suggested that too much daytime napping may signal an increasingrisk of Alzheimer's,and that faster yearly increase in daytime napping may be a sign ofworsening or unfavored clinical development of the disease.Researchers have acknowledged that although the method of the new study has beenwidely used in sleep field studies,they recognize that polysomnography(多导睡眠记录is the gold standard for sleep scoring.Moreover,the participants studied were older,and therefore,the findings may not be easily translated to younger people.In addition,future studies should test whether a direct intervention in daytime napping can lower therisk of Alzheimer's."We hope to draw more attention to daytime sleep patterns and the importance ofpatients noting if their sleep schedule changes over time,"said co-senior author Kun Huof the Medical Biodynamics Program."Sleep changes are critical in shaping the internalchanges in the brain.”32.What does the new study of older adults show?A.The link between daytime napping and Alzheimer's.B.The causes and symptoms of Alzheimer's disease.C.The proper amounts of daytime napping.D.The ways to improve the quality of sleep.33.How did the researchers conduct the new study?A.By asking about the participants'ideas.B.By carrying out a particular questionnaire.C.By tracking participants'sleep with a device.D.By assigning participants calculating tasks.高三英语试题第7页（共12页)