A "brain sheet" is simply a reference used by nurses so they can keep track of important information about each patient. This sheet is often filled out with key information during change-of-shift report and then updated as things change (and they always do!). The sheet is then used at the end of shift to give report to the oncoming nurse, making a good brain sheet key for patient safety and effective communication. If you're looking for the "Run Sheet" it's toward the bottom.
One-patient per sheet (critical care)
Multiple patients per sheet
Download a Sample "Run-Sheet"