We have a single cat in my apartment around 10 months old. We notice that after he is done peeing/pooping he covers his waste in the litter box but starts scratching the wall around the litter box. It seems like he thinks the wall is an extension of his litter box. At times he will cover his waste, scratch the wall and come back after sometime to repeat scratching. We have recorded a 30s video which can be found here: https://youtu.be/NkgZUr-NN34
This is not really an issue but it is an annoyance, because he wakes us up in the middle of the night with his scratching. Can we do anything to avoid this behavior?