Last night I woke up around 4am to the sound of 3 knocks against what sounded like my bedroom window. I've heard noises and bangs before when drifting of to sleep and assumed it was just my brain coming out of a deep sleep. I told my wife about it this morning and she said that it's happened to her this week as well. The most reasonable conclusion is something just happens to hit our window but doesnt seem likely. What makes it more strange is we have a full walk up attic and I had a security camera up there for awhile. Last week I was up there and noticed it was turning to look at where I was. So I unplugged it and brought it downstairs and when I get downstairs my sons toy is playing a nursery song with no one around. Adding to that last weekend I was working on the bedroom you access the attic from and put a new doorknob with a lock on the attic door. So now the attic door locks and we start hearing knocks at night. I'm sure it's all coincidence but still creepy. Has anyone experienced anything similar?