sounds like a sleep disorder
called sleep apnea
, and it is when you actually do stop breathing in your sleep. sometimes stress
can cause this but you need to sign up for a sleep study at a hospital and see your doctor to talk about it.
in a sleep study they will monitor you while you sleep for a night and then tell you whats going on . some people have to be hooked up to breathing machines at night, although in your case it doesnt seem to be that severe where you would need the machine, you should still get it checked out before it gets any worse.