I don't think I'd like having different working times each week - I like having the same hours every day.
Well yeah, it's not the best.
Though it's easy for me.. I call even the 7 pm morning if I just woke up etc.. I sleep well during the day too, for me it's normal to eat my lunch at 2 am or anything..
Always the same.. I wake up, prepare for work and I eat on the middle of work. No matter what's the time.