Chocolate does not affect my sleepwalking

As part of my investigation of what factor impacts my sleepwalking, I looked at the effect of chocolate because of the vague link between antioxidants and sleep benefits.  

Chocolate has no effect on my sleepwalking, as shown on the graphs below.
Data exclude nights with clonazepam and are normalized for the effect of coffee and tiredness.

Average values, +/- SEM. % variation and statistical significance are indicated (if less than 1%)