Dopamine is known to have five receptors (D1, D2, D3, D4, D5 receptors) which are divided into 2 families (D1 and D2 like receptor families). D1-like family receptors include D1 and D5 receptors and D2 family receptors include D2, D3 and D4. The D1-like receptor family plays a role in memory, attention, impulse control, regulation of renal function, and locomotion (D1 receptor), as well as decision making, cognition, attention, and renin secretion (D5 receptor). The D2-like family of receptors play a role in locomotion, attention, sleep, memory, and learning (D2 receptor), as well as cognition, impulse control, attention, and sleep (D3, D4 receptor) .