White noise/receiver sensation.

[cobalt]

  Ive noticed that during whole year there are few times this happens(already 4..5 times experienced this).
  This happens during sleep. Everything is as normal until one point where i have a sensation of something imminent, and other sensation that "asks" me to confirm if im ready "to begin" or something like that(hard to describe, but it feels very similar).
  When i mentally confirm/advance to this something noise like state kicks in by wavy-like sensation filling whole my dream body and replacing all my dream or any world senses. At this point all there is(all i feel, hear, see, think) is something i could describe like scanning trough entire fm spectrum - mostly static, with some stations or mix of them: voices/music etc. So for few(~10) seconds this thing is rushing all over me, and after the initial "kick" feels quite pleasurable, then in few seconds it fades away, leaving me completely conscious and awake and a little buzz still in my head/body slowly fading away.
  So what is this, already quit regular occurrence. Is this spontaneous vibrations one can use to project? Is it just a dream (im quite in doubt coz usually during them i feel very conscious, like being already woken up and then thrown in this soup of noise), or something else.
So if its vibes, how do i prolong them/get OBE, if not any suggestions on what could it be welcome.