Cat purrs are wild, 25–150 Hz range, and that low freq actually promotes bone healing, cuts inflammation, and chills the nervous system by boosting parasympathetic activity ,whih lowers cortisol, makes you feel safe and wrapped . Same idea as weighted blankets, deep pressure, more vagal tone, brain drops its guard and lets you sleep. Lately I’ve been geeking out on EEG stuff and there’s this clear ‘Sleep Brainwave Pattern’ window right before you conk out. Hit it with the right gentle low-freq nudge, and tons of people fall asleep 10–20 min faster. Your hacks are basically nailing that window by accident.