Black tea does not affect my sleepwalking

As part of my investigation of what factor impacts my sleepwalking, I looked at the effect of drinking black tea.This is mostly to determine how safe or dangerous this drink is in correlation with my sleepwalking.

Drinking black tea does not affect my sleepwalking (see graphs A, B, C, D, E and F), at the opposite of coffee.

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

Data exclude nights with clonazepam and are normalized for the effect of coffee and tiredness.