Okay, channeling has its obstacles. Be very wary. Do not be deceived.

[Unbound]

There are protections which are natural when we sleep as the body, just normally, needs to be maintained and protected during sleep. If you are channeling while you sleep I would maybe address it as perhaps part of the sub-conscious mind seeking to emerge but has no place to do so in waking life. I wouldn't worry about negative entities in such a case.