I Tried Sheryl Sandberg’s ‘Spiral-Notebook’ Productivity Hack for 30 Days. Here Are My 5 Takeaways. Posted by January 10, 2018 Leave a comment on I Tried Sheryl Sandberg’s ‘Spiral-Notebook’ Productivity Hack for 30 Days. Here Are My 5 Takeaways. When in over your head, ask yourself “What would Sheryl do?”