Was I asleep and dream this, because I swear I was awake when this happened?

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This is how it seems to have happened. I woke up to a sound of a child in my room. When I opened my eyes, I saw a child that was not mine walking from my bed to the bedroom door. The child stopped looked back at me, and giggled, then left the room and shut the door. I was out of bed in a heartbeat, and tried to follow the child. By the time I made it to the bedroom door, there was no giggle, no child. All doors and windows were locked, and my own children were all fast asleep. Now because this happened at night, I could have dreamed this, but if that is the case, when did I actually wake up. I know my bedroom door was partially ajar when I went to bed, so if this is a dream, who closed the door? If this wasn't a dream, and this isn't one of my children, is it a spirit? The only thing different in routine on this night is the cat didn't want to come inside. The cat usaully sleeps on my hip or belly all night, but that night, he just wouldn't come in the house. Also come evening, the cat won't leave my room, like he is protecting it from something. He will sit right inside the door of my room until I go to bed, then he hops up and curls up on my hip, or tummy