Even though sabbaticals are far from mainstream, more and more people are starting to write about this.

• The OG is DJ DiDonna who has done tonnes of research on this topic. He has a website full of great info here: https://thesabbaticalproject.org/
• Sachin Kataria writes about sabbaticals on linkedin https://www.linkedin.com/pulse/going-sabbatical-sachin-kataria/