Figure: Schedule manager in SuperMemo makes it easy to adjust the schedule in case of waking up late. Unfix is the default: let your schedule flow as if nothing happened. Leave unchanged may need to be used if some of your fixed activities cannot be moved (e.g. a meeting). Shift in proportion is useful for those who struggle with phase shifts: it compresses earlier slots and provides more room for later slots. In other words Shift in proportion gradually eases your activities back to the optimum circadian frame. Most importantly, your evening routine will be extended to promote earlier sleep