⁴A related well-known Stoic exercise is a bedtime recollection of what you did during the day (Epictetus, Discourses, III.10.3; Seneca, On a Happy Life, VI). While this may be difficult to understand or justify in our framework, one effect seems to be to reduce experience replay (presumably ordinary events, not philosophical ideas) during sleep: ”Oh the blessed sleep that follows”, exclaims Seneca. This exercise seems to be a case of deliberate replay, but of a very different kind from what we discuss in this chapter.