Windows

I dreamed that I entered what appeared to be my bedroom in a my house, (I was it aware that it was my room, however different entirely) and I noted fragments of glass on the floor, trying to understand where the glass may have come from I looked up to this window which was like a large metal frame skylight. The window appeared open, and I thought I saw a crack in glass, which would possibly explain the glass on the carpeted floor.
Panicking, I left the room to seek advice and on returning with another person (I think, can;t be sure), I saw that the fragments of broken glass were actually small glass pebbles and at the end of my bed on the floor were 2 cushions as though someone had been seated there. I was angry as I thought someone had been using my bedroom for some purpose of therapy, or just using my room.
Strange as it all sounds, it was a rather lucid dream that has stayed with me over previous weeks.
Please can someone help with this?
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