Several things can stack up by night. You are tired, your attention has been used all day, and there may be less social accountability around a late purchase or emotional message. The pattern shows up in real life: people often make cleaner high-stakes choices when rested and less emotionally charged.

The widely cited Israeli judges study found parole rulings varied by session order and breaks, but the effect's cause is debated and other factors may be at play. The practical lesson is still useful: schedule important decisions before fatigue sets in when you can.