Weighted blankets were originally developed to ease anxiety and depression, so they are more than just another layer of bedding. The science behind these blankets is called Deep Pressure Therapy, or DPT. DPT has been used as a treatment method for mental health conditions, including anxiety and depression, for years. When pressure is applied to your body, the parasympathetic nervous system (PNS) is activated. Your PNS is responsible for your “rest and digest” functions while the sympathetic nervous system triggers “fight or flight” responses, meaning once the PNS is activated, your body begins to relax and wind down.