That's the logical side. However I still decide to check out the 4 places that some menace could be hiding. Thankfully there was no one lurking in the closets or behind the small bamboo plant thing.
This left the balcony.
Suddenly I had a flash of any horror movie I've seen where the damsel (that's me) checks out the menacing noise and is promptly dismembered. This is when I decided to close and lock the balcony door (on the 24th floor) in order to show the murderer/cannibal menace who the boss is. Then promptly turned on all the lights and ran back to the security of my bedroom.
So far. No menace.
Lesson learned? I have a slightly over active imagination.
I hope the lurky menace doesn't have an axe... Or know how to pick a flimsy lock.