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A team of researchers with Lausanne University Hospital has found evidence that challenges the theory that slow brainwaves during sleep indicate the person is feeling that they are deeply asleep. Their study results are published in Current Biology.

For many years, medical science has held firm to the belief that it is possible to tell how deeply a person is sleeping by watching their brainwaves on an EEG readout. In this new effort, the researchers challenge that notion by taking a closer look at what happens with people who suffer from chronic insomnia.

To learn more about insomnia and to possibly find a cure for it, the researchers asked 10 people with insomnia and 20 people who generally sleep normally to undergo EEG recordings as they slept in a lab. Each also reported on the quality of their sleep. The researchers also performed 787 awakenings of the volunteers to get near-instant feedback regarding their quality of sleep across sleep stages.

In looking at their data, the researchers found that normal sleepers reported experiencing their lightest sleep during the first two hours of sleep, lipitor off patent a period of non-REM sleep. The insomniacs, on the other hand, reported feeling more awake than those who slept normally those first two hours. They also reported feeling like they slept more lightly during REM sleep, which prior research has suggested is the time when people normally sleep the deepest.

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