COLUMBUS, Ohio — Here’s a pretty good reason to make sure you’re getting enough rest and relaxation in your life. More than a third of people are walking around with the same symptoms as concussion due to stress and lack of sleep, suggests a new study. A survey of more than 31,000 people shows that insufficient sleep, mental health problems, and stress were the causes of a whole host of symptoms doctors are used to seeing in head injury patients. Symptoms of what doctors call post-concussion syndrome (PCS) range from persistent headaches, dizziness and anxiety, to insomnia and loss of concentration and memory.