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Most scientists agree that human sleep is very much a mystery and also tired animals are the best.
Studies have found that neural activity produces metabolic waste. While our brains do clear it during the day, they are much more efficient at doing so while we're asleep.
A study showed that when participants were told they got a good night's sleep, they performed better on tests than those who were told they slept poorly, when in fact both groups had the same sleep conditions.
In a study controlled for environmental factors like increased light, participants experienced less deep sleep and took up to five minutes longer to fall asleep during the full moon.
Nap away! Naps between six and 30 minutes have been shown to improve memory in study subjects.
Research has found that naps 60 minutes and longer were associated with an increased risk of type 2 diabetes.
Studies have found that late chronotypes (more commonly known as night owls) frequently experience a type of jet lag, are more susceptible to depression, and have more addictive personalities.
While scientists are still working to determine why, research has shown that genetics has more influence on subject's BMI when they are sleep deprived than those that are well rested.
If that's not scary enough, in the same poll conducted by the National Sleep Foundation, one in six train conductors and truck drivers admit to similar near misses while on the job.
Lack of sleep can lead to a whole host of problems such as depression, anxiety, and mood swings, and in extreme cases can even lead to death.
Humans and pigs both sleep an average of eight hours a night, and cats, unsurprisingly, spend half their day sleeping.
In a sleep research study, 30% of blind-since-birth participants reported smelling in their dreams compared to only 15% of non-blind participants. Blind participants also reported touch sensation in 70% of their dreams compared to 45% of the non-blind participants.
According to a Hong Kong–based study, severe bed-wetting cases in childhood that weren't properly addressed just carried over into adulthood.
A recent study found that most nightmares are driven by the emotions of sadness, disgust, guilt, and confusion.
The technical term for this is "hypnic jerk." And scientists have no idea why we do it. One theory is that the mechanisms that keep you awake and help you fall asleep are basically picking a fight with each other.