I don't think they are hallucinations, I think there are things that we don't understand. But I guess the just before sleep ones can be a type of hallucination, that happens between wake and dream state, and it's common and normal people experience this. I hear different voices call my name, Sometimes it's me or my husband or someone I have never heard before. I have heard the pager or phone go off when it's not.three knocks at the door and no one there. It's really a type of sleep disorder. Can happen when just waking up too.
Other things can't allways be explained away as hallucination.