username, thanks for those mekoros about pictures of tzaddikim. I find it very interesting and wonder why it does not border on לא תעשה לך פסל וכל תמונה.
As to this question of yours: “What, that feeling guilty is called enough Tzaar to avoid sleeping in a Sukkah?”
Feeling guilty that you can fall asleep, which is a mitzvah, can be called tzaar and therefore patter you from sleeping? Doesn’t make sense.