Since sleep disorders happen while you’re asleep, there are some signs you can look for during the day. You can also have a friend or loved one watch for these symptoms when you sleep. You may be suffering from a sleep disorder if you: Have loud, excessive snoring. Wake up frequently during the night. Feel drowsy and tired during the day. Struggle going to sleep because your legs feel itchy or crawly. Have a sore throat or headache when you wake up. Have trouble focusing at work and staying alert