Human Hearts do move

If you were not aware, it is possible for the human heart to drop in the lower region of ones body, and then jump in the throat and start beating again.
I was cooking dinner yesterday and heard Graham's distress call. One he often makes when he has crawled on Emma's bed and can't get down.
I heard the call and started towards her room and movement at the top of the staircase caught my eye. Graham was clinging to the railing, letting me know he had gotten up there and could not get down. Now if you know my house, you know while cooking dinner, you can look through the stupidly placed windows and see the stairs. How he got as far as he did without me seeing is beyond me!
He scaled the baby gate and had started his hike to the loft, that has yet to be finished. NO Rails up there.
I am considering plastic wrapping the stairs so no one gets up there!