Self-indulgence is a term used to describe the act of treating oneself with excessive luxury or pleasure. It can refer to spending money on expensive items, eating too much, or engaging in activities that are not beneficial to one's health. SPREES are a type of self-indulgence where one engages in a period of unrestrained and often excessive activity. This could include shopping SPREES, eating binges, or other activities that involve overindulging.