Update on the FWS. By the tenth day of using this gadget, just once a day in the afternoon, I began to have over-stimulation symptoms. I felt an increase in my pulse and a hyperactive feeling, which continued for several hours afterwards. Luckily, it didn't make my sleep worse, but it also did not improve it at all. I'm relieved that there were no long-lasting adverse effects. Once I stopped using the device, the increase in pulse and hyperactivity diminished by the next day. This device, according to the marketing, is used for depression as well as insomnia. I don't have issues with depression. I'm a creative and enthusiastic person, with a tendency to get easily over-stimulated. Anything that boosts my mood and my enthusiasm beyond my already very adequate "normal" range, and pushes me into the hyperactive range, is guaranteed to fail as a remedy for me. The FWS has earned an F grade, and has been returned.