After 50 years of research, eminent Stanford University sleep researcher William Dement reportedly said the only solid explanation he knows for why we sleep is "because we get sleepy".
Do You Sleep on Your Back or Side? Here's The Science on 'Optimal' Sleep Positions
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What Are the Best Positions for Sleeping?
What Are the Best Positions for Sleeping?
Do You Sleep on Your Back or Side? Here's The Research on 'Optimal
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Things You Should Know About Sleep And Low Back Pain
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Sleep Position - What Your Sleep Position Says About Your Personality