Oddly Wired
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memory

You only clearly remember the start and end.

People recall the first and final items in a series better than those in the middle.

This is known as the serial position effect. Information presented early occupies your working memory, while late items remain in short-term storage. Everything in between is processed with significantly less clarity.

The middle of your day is the most likely part to be forgotten.

Where this comes from

Study
Murdock (1962)
What the check found
The serial position effect is a well-established phenomenon defined by Bennett B. Murdock Jr. (1962). The provided text is factually correct in its description of the effect, even though the provided references did not contain the quote.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.