Restraint bias
We overrate our power to resist temptation, and walk straight into it.
What it means
The tendency to overestimate one's capacity for impulse control, leading people to overexpose themselves to tempting situations they wrongly believe they can withstand. It stems from the hot–cold empathy gap: in a cool, satiated state we cannot vividly simulate the grip of a future craving, so we judge our willpower against a temptation that feels weaker than it will. Paradoxically, those most confident in their restraint take the biggest risks — keeping the cigarettes nearby, the dessert in the fridge, the gambling app installed — and so relapse more, not less. The practical lesson reverses naive willpower advice: effective self-control is less about heroic resistance in the moment than about situation management that keeps temptation out of reach in the first place.
Examples
Smokers trying to quit who felt most able to resist deliberately put themselves in tempting settings and were more likely to relapse months later.
The dieter most certain she can 'just have one' is the one who buys the family-size biscuits and leaves them on the counter, then finishes the packet by Thursday.
Someone confident he can ignore his phone leaves it face-up beside the laptop all day, and loses more hours to it than the colleague who locks it in a drawer.
First described in Nordgren, van Harreveld & van der Pligt (2009).