They mostly happen on Tuesday's and Thursdays, because those are my most stressful days (8 hours in school, evil teachers, lots of homework to do which I never do) but they have happened on Wednesdays (my best days), and Saturdays (when I have choir, especially if we have a concert soon) or before choir concerts if they are important. Usually on Sundays I am exhausted and sleep all day and am grumpy.