Vibrations while sleeping

The following questions are targeted to Vipassana. Nevertheless, contributions from other traditions are appreciated. - is there any stage where it is expected that meditators feel vibrations while sleeping ? -- If yes, then how should this be managed ? -- Moreover, how to handle this when vibrations are so intense that it is impossible to move during this experience ? - What if it is not clear if such experience is while dreaming or awake ? Sometimes it is not clear if such experience happened in a dream or in real life. - Moreover, is there any guideline on how to manage experiences that happen while sleeping ? Answers with references are strongly appreciated.