Scientists have explained why people want to sleep, even if they just got out of bed after 8 hours of sleep. According to research, many people in the 21st century suffer from hypersomnia. This is the condition when a person wakes up after 8 hours of sleep, but really wants to take a nap. If these are one-time cases, then there is nothing wrong with that. However, many people suffer from this condition for a long time – from a few days to several months.

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