Me myself was leaning more towards the pipes, like If you have functioning air chambers or water hammer arrestors, you might have a different problem. The straps that connect your plumbing to your home's wall studs could be loose, causing the pipes to vibrate, creating a knocking sound..... but if you check that and everything's fine, then I suggest otherwise (ghost/spirit).
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Hold fast to dreams
For if dreams die
Life is a broken-winged bird
That cannot fly.
Hold fast to dreams
For when dreams go
Life is a barren field
Frozen with snow
*Langston Hughes*
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