The tips begin at a different place in each module. The advice moves along with the stages of the course.
You must get a full night's sleep every single night. Never trade sleep for study. Sleep is crucial for memory consolidation, mood, and attention. When you face the choice between going to sleep or studying another hour, sleep always wins. Sleep is when your long term memory consolidates. Your hippocampus and cortex communicate with each other all night, consolidating long-term memories of the material you studied during the day and connecting those to other memory items. If you don't go to sleep, you don't complete the learning process.