Published September 6, 2017
Researchers looked at data sleep and cognition data from over 1,700 participants. The subjects participated in sleep studies, answered questions about their sleep, and took cognition tests. The researchers evaluated their breathing issues according to the apnea-hypopnea index. They assessed participants as having sleep-disordered breathing if they had more than 15 stopped or shallow breaths per hour and as having sleep apnea syndrome if they had more than 5 such breaths. They found links among daytime sleepiness, sleep apnea syndrome, slower cognitive processing speed, poorer attention, and poorer memory. And these links were strongest in the participants who had the APOE-4 allele.
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