Yes, oxycodone can make you feel sleepy because it acts on the central nervous system to reduce pain signals while also slowing brain activity. Drowsiness is one of the most commonly reported side effects, especially when starting treatment or increasing the dosage. Combination medications such as Norco (contains hydrocodone and acetaminophen) can also cause similar sedative effects, as both drugs belong to the opioid class. The level of sleepiness varies depending on dosage, formulation, individual tolerance, and whether other sedating substances are used. Understanding how opioid pain medications affect alertness is important for safe and responsible use.