While everyone's experience is different, many people find that taking Suboxone makes them feel tired and sleepy. This is because the medication contains buprenorphine, which is a partial opioid agonist. This means that it works by binding to opioid receptors in the brain, but it doesn't produce the same level of euphoria or pain relief as other opioids. As a result, people taking buprenorphine often report feeling more relaxed and sedated than usual. In some cases, this can lead to drowsiness and fatigue. However, these side effects usually subside after a few days of treatment. If you're finding that Suboxone is making you excessively drowsy, speak to your doctor about adjusting your dose.