via YSK:
While it is true that sleep is a major part of memory consolidation, it is often overlooked that initial daytime consolidation is very significant. Taking a microbreak (doing nothing or a low stimulation activity, resting your brain for a few minutes) after a lot of input can make a big difference for your memory along with other benefits such as boosting vigor and reducing fatigue. Easier said than done tbh, but worth noting.
https://pmc.ncbi.nlm.nih.gov/articles/PMC7024394/pdf/nihms-1557224.pdf