How much sleep are you getting? Too little or too much sleep can create chronic stress, scientists say. It can also negatively impact the hippocampus, a part of the brain vital to learning and memory.
As people sleep, their brains work to consolidate memories and process things learned during the day, particularly during what's called deep sleep, she said. Deep sleep may also allow people to purge toxins from their brains – and reduce the harmful deposits of an abnormal protein, amyloid.
But the study has its limitations, including the fact that participants reported only sleep duration versus sleep timing, sleep efficiency and circadian rhythm. Participants also reported their own sleep, leaving room for bias. They also recorded sleep times by the hour, not minutes. For starters, he said the health status of the participants wasn't noted and neither was body mass index.
"Each of us needs to define how much sleep we need and then defend that behavior," he said."Sleep is amazingly dynamic. It changes, of course, as we age and it changes between people hugely. I think by creating the impression that seven hours is optimal is misleading because it's optimal for the average individual, but there's a huge range."
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