Am I being haunted, and if so, by what?

For about a year now I have been experiencing some strange occurances. They seem to be getting worse as time progresses. At first, it was just little things that I could easily shrug off like cold spots, random chills, eerie feelings, etc. Then it was popping noises and gusts. I had a voice come through my computer speakers twice. I'm not sure if there could be an explanation for that as well. The time that these things were happening kind of bothered me. It was 3 AM usually. I started having nightmares about 4 or 5 months ago. They are terrible. The first one, I woke up sweating and crying. The dreams are terrifying that it makes sleeping unusually hard. The nightmares have only gotten worse. I take sleep aids to help with it. Just this past week, I was touched as I was laying in bed awake. I was told by a friend that it could have been a percieved touch. I keep telling myself that so I will believe it. My 1 year old nephew seems to be facinated by something in my house when he is here. He points and laughs randomly. Once he was doing that then turned around and started crying. I'm not sure if that had anything to do with it. Many other things have happened but I won't share them all on here. Please, if anyone has any explanation as to what I am going through, tell me. I am scared and unsure of what to do. Thank you for reading.