Study: Too much sleep leads to nightmares

[LadyStanley]

http://sanfrancisco.cbslocal.com/2017/08/02/sleep-study-nightmares/

Excessive sleep is linked to more nightmares, according to a new study. The study found that more than nine hours of sleep can result in an uptick in nightmares.

Researchers surveyed 846 people about sleep quality, nightmares, worries, drinking and exercise. They found that worrying about the future before bed was a strong cause of nightmares, which made sense to them. But researchers were surprised to see that excessive sleep also was linked to causing nightmares.

So, stop worrying and get (just) your (up to) 8 hours in.

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[WTFetus]

Seems like a minor factor that KCBS is exaggerating (doesn't seem like a significant cause in the paper). Because using the REM reasoning, wouldn't more sleep also give the person a higher chance of good dreams and better memory processing?