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involuntary adult head thrust/bob

I have recently started seeing a guy and noticed one day, probably the second time I was with him, that while he was facing forwards looking into a field he was slightly thrusting his head forwards.  There was no pattern and it wasn't very exaggerated but it was noticeable.  There is also a slight exhale noise that he does in conjunction with this that isn't loud but sounds somewhat like "hm".  The only other time I noticed this was when we were watching tv and he was, again, staring.  This time he was obviously staring at the tv. I noticed this time that it looked like he might have been trying to physically suppress it by holding his middle and index finger under his chin.  I'm just curious as to what this is.  I want to ask about it but I don't want to make him feel self conscious because its not anything to feel bad about.

Thank you!
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