Answer an earlier day's question
Each day's question stays under that day's card in the Journal, so you can come back and answer it.
A question does not disappear at midnight. Scroll back in the Journal and each day that had one still shows it under that day's card, labeled A question from yesterday or with its date. A small check means you answered it.
Tap an unanswered one to answer it now. It opens that day's question, and when you tap Done the answer is saved on that day, not today, so it sits with the rest of what happened then. Earlier days do not offer Not feeling this one?: a day keeps the question it had.
Tap an answered one to read your answer, with Edit and Delete on hand.
A day only has a question if one was offered to you that day, so days before you started, or days you did not open the Journal, have none. Unanswered questions stay for about a year; answered ones stay for good. A question only shows under a day that has a card in the Journal.