I your house in close proximity to power line? EMF are a big cause of claim of paranormal. It can cause everything from headache and fatijue to hallucinations and paranoia. EMF are typically the first thing a paranormal investigator checks. Hijh EMF can be caused by power lines, unproperly closed electrical boxes, copper wiring, exposed main electrical wiring, ect.
If it not any of that, than maybe the tap and footstep could just be the house or vent settling. I know in my house, when it settle it sounds exactly someone tapping and even footstep.
Im not saying any of those are the exact answer to your problem. Im just trying to give you alternative options for what you are experiencing because they are tanjible things that can be fixed and easily understood.
If you have looked into that stuff and none of them could even slijhtly be the cause, than it could possbly be paranormal, but cannot be concluded to be paranormal.
Hope i helped a little, if you have any question, feel free to mail me anytime.
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