Tremor in the night.
Subsidence.
Sleep walking
Poor memory (baby episode)
Rats
Pets
Magnetic interference (cupboards and drawers have metal joints and rollers)
The posters off the wall? Heat fluctuation or humidity can loosen blu tack or drawing pin adhesion
So many logical explanations that ghosts should be the last one. Better to ask yourself why your Mum wants you to believe it's ghosts
...
Ghosts don't exist, but our mind is capable of making us think they do, even to the point of realistic hallucination.
I thought I saw two ghosts on one occassion when I got lost in the woods when out walking with my much younger siblings once. I was about ten. My whole life since then I'd been convinced they were ghosts.
As an adult, I gradually accepted those 'ghosts' inspired me to think more logically about my then circumstance
ie one ghost came running from behind on horseback at a point Id become disoriented ... so my mind visualised my feeling of disorientation and helped to steady my panic
And the other was a group of adults and children playing in a clearing in the middle of the wood. Yet I never went over to them to ask for help.
It was mind reassuring me there was a happy solution to my problem.
But then read this:
Years later, I also learnt there were other ghostly sightings of a group of adults and children in that wood clearing. Gypsy family berating their children from olden days thus the origin of the name of the woods.
I'm with Mulder on paranormal stuff. Deep down, we all know ghosts as entities don't exist, but we'd like to believe they do. Either way, if you believe or don't, 'they' can be useful.