I'm fairly certain that "to sleep, perchance" was written by Marta. First of all, I'm somewhat familiar with her academic background, and the notes for this story reflect that.

Also, this story was written by a pinch hitter, since the treat written for the same recipient was created by the author that was originally matched with them but had to drop out. There was no gift offered for Marta, which tells me she only signed up to be a pinch hitter. So I'm fairly confident I'm calling this one correctly.