Refers to the period of the day from sunrise until noon, typically when people wake up and start their daily activities. It's often associated with breakfast and the beginning of work or school.

日(ひ)の出(で)から正午(しょうご)までの時間(じかん)。目覚(めざ)めて一日(いちにち)の活動(かつどう)を始(はじ)める時間(じかん)で、朝食(ちょうしょく)などと関連(かんれん)します。