Not sure yet if this due to electrostatic (charge) variations in time.
See nearby posts.
Later addition:
By today's investigation it turns out that it may not be the Tempur mattress that causes the low frequency thump.
It seems to be an indirect effect.
gently touching the mattress makes some wire vibrate. Change of capacitance is read by amplifier and sound is created.
It remains to find out why gently touching hair produces sound through this setup.
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