…………………………….. are commonly called sleeping pills.

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Question**: The question asks for the term that is commonly referred to as "sleeping pills."

2. **Understand the Context**: Sleeping pills are medications that help individuals fall asleep or stay asleep. They are often used to treat insomnia and other sleep disorders.

3. **Recognize the Type of Drugs**: The primary category of drugs associated with sleeping pills includes central nervous system depressants. These drugs work by calming the brain and promoting relaxation.

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