You know what else can cause racing mind syndrome? Apnea. This is when stop breathing periodically at night. The kind that are caused by the muscles in your throat relaxing and closing off or restricting your airway can be treated.

What happens is you start to drift off, you relax, an apnea happens, and your body gives you a dose of adrenalin to help wake you up to breath. Hence the mind racing. Often you don't even realize you had started to drift off at all, and just think your mind has been spinning wildly keeping you awake.