At lower doses, opioids may make you feel sleepy, but higher doses can slow your breathing and heart rate, which can lead to death. And the feelings of pleasure that result from taking an opioid can make you want to continue experiencing those feelings, which may lead to addiction.

Why does painkiller make you sleepy?

But do opiates make you sleepy? Yes, they make you drowsy because your respiratory system slows down but they are not considered a sleep aid. They can be dangerous when taking too much and your heart can slow down that you stop breathing.

Is drowsiness a side effect of painkillers?

Sometimes opioids can cause sedation, drowsiness, or sleepiness for the first day or so or after a dose is increased. Some people find that they become confused, disoriented, or simply absentminded after receiving a medication for pain relief. If such effects become pronounced, tell a doctor immediately.