What was that?

CRASH! I heard a tin on the floor. Next a Boom! Something has crashed into the wall. I ran out of my room to find an open can of dried tomatoes on the floor by my feet. I picked it up and threw it in the bin. I was 4:00 am at night, so everyone was asleep. CRASH! It came again. This time from downstairs. I had no time to lose. I ran downstairs like a lightning bolt hitting the ground! When I got to the playroom, I was left with nothing but lego, all along the floor. I then realised that the door was open! I ran out through the back door. I looked around but saw nothing. It was pitch black! I ran back upstairs to get a flashlight, but as I did, I heard something on the trampoline. I grabbed the torch and ran outside, but as soon I got there, they were gone. That is when I got scared. They could be anywhere in the house at the moment! I ran to tell mum, but she didn't believe me. I tried going back to sleep, but I couldn't. Before