"While we didn’t feel anything physically when they fed on us, our mental states were another matter. Sometimes they’d feed on you just a little, leave you with a bit of depression, maybe a little sadness, or some anxiety. Sometimes they’d feed too much, though this was less common. Overfeeding led to hysteria, madness, and other mental ailments. Sound people would snap over-night."
'We Named Them' by Nik Patrick