Hyperarousal is a term I mention when people want a quick explanation for what’s behind insomnia. The word seems to resonate. Think of hyper- as in “excessive” or “extreme”; arousal, meaning “activation” or “animation.” Or plain old hyper, meaning “very excited, nervous, or active.”
“Hyperarousal” is a pretty good way to describe the feeling of insomnia at night. But is there a test for it? Does it happen only at night, or do insomniacs experience hyperarousal 24/7?