That common technique of waiting until last minute to start a project only seems beneficial. As Peter Elbow has pointed out, this method helps to kick a tricky audience out of your head because you simply can't afford to ponder them: it's "do or die" time. In a paradoxical way, waiting until last minute increases mindfulness because it allows the writer to focus on themselves while composing
On the other hand, mild happiness resembles the state of equanimity which Sharon Salzberg has described as the ability to allow things to be as they are by putting large space around events and observations. Equanimity is about our stance on external events--how we relate and respond to them—whereas refers more to how we relate to internal developments arising inside ourselves.