Hi guys.I have a sleep disorder for years and something happening which i dont know what it exactly is.I have insomnia.I cant sleep at nights.But when i am on the way dreaming first i see am riding something.It changes everytime.Like am riding bike,skateboard or i am in the corner of the skyscrapper then suddenly i fall and i wake up frightened.Whats happening? Its about 2-3 years i have this and it happens once or 3 days repeatedly and mostly every week! Waiting your advices!

Thanks!