Why the Middle of the Night Gets Hard to Read by Morning
The middle of the night can feel sharp while it is happening.
By morning, it can become one rough summary: sleep broke, the night was difficult, the day began off. That summary may be true, but it does not keep the details that make the night useful later.
The hour matters. The length of the break matters. What came before it matters. What happened after it matters. The morning matters too. Without those details, several different nights can begin to look the same.
Write the time, what woke or unsettled you, what had happened before bed, how long the break seemed to last, whether sleep returned, and how the morning felt. That is enough to keep the night from disappearing into one general feeling.
This belongs with what to write down after a broken night, what to track when sleep breaks during the night, and the hour sleep breaks can matter more than it first seems.
The night does not need a theory before sunrise. It needs enough detail to be readable later.