Main outcome measure is to assess if there are differences in DA release between the morning and the evening (displacement of [11C]raclopride binding after MP) and to determine if these diurnal patterns differ in cocaine addiction. Secondary outcome measures are: To assess if DA signaling correlates with reactivity of brain regions to exposure of food and drug cues and with functional connectivity of the reward network and to assess if the reactivity of the reward network shows circadian variability. We will also assess if differences in DA signaling between morning and evening correlate with circadian typology and with measures of spontaneous motor activity and with sleeping patterns.