Are you over 40 and wonder what the magic amount of sleep every night might be? A new study arrives at an answer.
For the study, the investigators analyzed data on sleep patterns, mental health and well-being from nearly 500,000 British adults, aged 38 to 73, who completed a series of thinking tests. Brain imaging and genetic data were available for nearly 40,000 of the participants.
Seven hours of sleep per night was optimal for cognitive performance and mental health, according to the study published April 28 in the journalParticipants who got too little or too much sleep did worse on tests that measure processing speed, visual attention, memory and problem-solving skills. They were also more likely to have
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