Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

If so, you may not be getting all the oxygen your body needs at night. Your Dr. will check your oxygen level usually, which my be normal at those times. But when asleep, it may be low. It can cause those symptoms too.
Im having them myself.