No correlation of number of events between nights

As part of my investigation of what factor impacts my sleepwalking, I looked at a potential correlation between the number of events of 2 consecutive nights.The idea here was to see if my sleepwalking activity during 1 night impacts the following night, positively or negatively.

As the graph below shows, there is no correlation between consecutive nights, as the coefficient of determination is very low.

All 470+ nights are included, regardless of treatment or mitigating/aggravating factors.