Polyphasic sleepers are those who choose to cast aside the traditional 8-hour sleep schedule for a more economical system of precisely timed naps throughout the day, reports Van Winkle’s.

While the process begins the same for just about everyone, not all polyphasic sleep schedules are created equal. There are three main variants: Everyman, Uberman and Dymaxion. Within each, daily naps are carefully calibrated and tailored to hours that correlate with natural dips and crests in alertness. Strict adherence is required.