The 3P behavioral model,[1] also known as the Spielman model, the three-factor model, or the behavioral model is the first fully articulated model of insomnia to gain widespread acceptance. The model delineates how insomnia occurs acutely and how acute insomnia becomes chronic and self-perpetuating. The model is based on the interaction of three factors. The first two factors (the predisposing and precipitating factors) represent a stress-diathesis conceptualization of how insomnia comes to be expressed. The third factor (the perpetuating factor) represents how behavioral considerations modulate chronicity. A schematic representation of this model is presented in Figure 78-2.