This story happened to me when my partner and I first moved into out current house 4.5 years ago. My partner had been staying at his mother's house for the night as we had been fighting a lot and decided to have some time apart.
After I had put our two boys to bed (they were 2 and 3 at the time), I decided to message my partner and invite him to come over so we could sort some stuff out.
I was standing in the lounge room watching him walk down my street and through my gate. I walked out onto the veranda to greet him and also so we could talk without waking the kids. Instead of being greeted with a kiss, a hug or even a, "Hey, babe, how was your day?" I got asked, "Who was that little girl standing next to you in the window?" I looked at him strangely as there were no little girls in my house, only me and my two BOYS. I shook my head and replied, "There was no little girl standing next to me. The only kids in this house are Tim (name changed) and Sid (name changed)." He looked at me quite strangely and said, "When I was walking down the road there was a little blond girl standing beside you holding your hand." My partner is not a believer in ghosts, so for him to say this it must of had some truth to it.
I have been living in this house for almost 5 years now, and I constantly hear cupboards and draws opening and shutting late at night when I know for a fact everyone is in bed asleep as at this point in time only myself and my partner live here.
Every now and again I do see a little blond girl peeping around corners, but she always disappears before I can look at her and I don't see her again for quite some time.
Things are forever going missing or being moved, more of my partner's stuff then my own: car keys, bank cards, you name it. He puts it down in a certain spot before we go to bed and the next morning it has been moved. We now have two girls together and although my boys are only his stepsons, he raises them as his own. They are currently living with close family friends, so I know it is not them moving things or banging things in the middle of the night.
With all the experiences I have had in my life, I find it hard to believe that I'm going insane, so there must be another explanation!