Given the background description of some cooking related query, summarize the question into a title

[EX Q]: I've been reading "The Bread Baker's Apprentice" and all the sourdough bread recipes call for overnight storage in the fridge. Is this really necessary? Can I just leave it out at room temperature and bake it that night? What is the purpose of storing it in the fridge for a night?
[EX A]: Cookbook says to store dough in fridge overnight, why can't I just bake it already?

[EX Q]: Sometimes I have only one sushi rice and want to prepare risotto, sometimes is the other way around.Both varieties have a lot of starch, but I don't know if it's the same starch. Is it?
[EX A]: Are sushi rice and arborio rice valid substitutes of each other?

[EX Q]: I made a jalfrezi today for tomorrow and I forgot to add spices, (cumin, tumeric, paprika).Is there a way I can add them now getting the most from them?
[EX A]:
Forgot to add spices to curry