My sister and I both 'bang' or 'rock' while awake. My sister bangs her head against the wall [we are in our 50's]. We have done this since very young. I have just discovered that babies who are not held much or nutured, do this throughout their lives. Your friend does it in his sleep, so I don't know if this applies. Both my sister and I had a not-so-nuturing mom. However, my baby brother was her joy in life and was cuddled, etc. [he's quite a few years younger than my sister and I] and he does not 'rock' or 'bang' Remember the Romanian babies in the orphanage over om that country, televised a few years ago? Those babies rocked back and forth; they were almost never picked up and held. It may soothe anxiety for your friend; though done unconsciously.
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