Substance use can significantly disrupt sleep patterns, leading to disorders like insomnia, hypersomnia, or sleep apnea. Stimulants, such as cocaine or methamphetamine, interfere with sleep by increasing wakefulness, while depressants like alcohol may initially induce sleep but disrupt restorative cycles. Chronic use alters circadian rhythms and reduces sleep quality, exacerbating fatigue and cognitive impairments. Addressing these disorders involves cessation of substance use, cognitive-behavioral therapy for insomnia (CBT-I), and in some cases, short-term use of sleep aids. Restoring healthy sleep habits is crucial for overall recovery and mental well-being.