You have probably heard that better sleep habits will fix this. Consistent bedtime. No caffeine after noon. Screens off an hour before bed. That advice is not wrong for people whose sleep problems are primarily behavioral or environmental. But if your sleep disruption is rooted in trauma-related hyperarousal or unprocessed threat responses, sleep hygiene alone is often not enough. Reviews of PTSD and sleep show that trauma-related sleep problems are maintained by deeper neurobiological and psychological processes than habits alone can address (Lancel et al., 2021). If the problem lives in the nervous system, better habits may improve the environment without resolving what is driving…