This
article from Newsweek outlines 5 myths about sleep and has an interesting comment about what perhaps is our natural sleep pattern (see (Myth 1)):
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Myth 1) Humans need 8 hours sleep a night; the reality is that different cultures sleep different ways and apparently Western Europeans used to break their sleep in to a "first sleep" of 4 hours, then got up for a bit, and went back for a "second" sleep. It is noted that this in fact may be better suited to our sleep needs and natural patterns.
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Myth 2) Sleep isn't just a bodily function; the reality is that sleep is one of our systems, like we have a nervous system, and is weaker or stronger depending on the person. Also wears out and gets fragile with age (and that's not good news!!!)
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Myth 3) Animals don't have sleep problems; the article states that this is not true but there is not much support for this one so I am skeptical.
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Myth 4) Falling asleep is a gradual process; the reality is that it is more of a switch but those with sleep disorders don't have a properly functioning one. I found this interesting as I don't usually have problems getting to sleep as staying asleep is my problem (and that I have a prescription to help me with)
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Myth 5) Sleeping less burns more calories; the reality is that as you get more tired your natural appetite depressants are decreased and you become more not less hungry.