There are several drugs that can make you sleepy, including prescription medications and illegal drugs. Here are some examples:

• Prescription Medications: Certain medications can cause drowsiness as a side effect or be used as a sleep aid. These include benzodiazepines, which are included in a class of drugs called hypnotics, and opioids. Other medications that can cause drowsiness or help with relaxation and sleep are known as depressants.

• Illegal Drugs: Some illegal drugs can make you sleepy, including marijuana, LSD, and depressants such as tranquilizers and narcotics.

• Over-the-counter Medications: Some over-the-counter medications, such as cold and flu medications, allergy meds, and sleep aids like Zyquil and Benadryl, are known to cause drowsiness.

Its important to note that taking medications outside of medical recommendation, whether they are legal or illegal, can increase the risk of other side effects. If you are having trouble sleeping, its best to talk to your doctor about safe and effective treatment options.