your pillow is an orthotic

We tend to think of human movement only in terms of exercising, but every movement or position you get yourself into is fed into your body’s “adapt to this” file. Your tissues respond to environment whether the environment is “sleeping on this mattress” or “running 17 miles.” The process is exactly the same. The reason NOT sleeping on your pillow or mattress hurts is the same reason running 4 miles beyond your regular running distance hurts. You’re just exceeding the boundaries of your tissue strength and created a load greater than what you body is used to...

Katy Bowman on sleeping without a pillow.
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