Harvard Health Blog: You’ll be more likely to remember the documents for the meeting if you go over the material you wish to remember daily for several days, each followed by a refreshing seven to nine hours of sleep each night. 

When you learn new information during the day, it is temporarily stored in the hippocampus, a seahorse-shaped part of your brain behind your eyes. The hippocampus has a limited storage capacity. If you exceed it, you may have difficulty adding new information — or you may actually overwrite an old memory with a newer one.