Sleeping is an effect of __________, but agitation may cause a person to wake up.DepressantsVitaminsIllegal drugsStimulants

The correct answer is Depressants.

Step 1: Understand the question. The question is asking for a substance that causes sleep but can also cause agitation leading to waking up.

Step 2: Analyze the options.

• Depressants: These are drugs that slow down brain activity. They can induce sleep, but if a person becomes dependent and then suddenly stops taking them, withdrawal symptoms can include agitation and insomnia.

• Vitamins: These are essential nutrients that the body needs to function properly. They do not typically induce sleep or cause agitation.

• Illegal drugs: This is a broad category that includes many different substances with a wide range of effects. Some might induce sleep or cause agitation, but without more specific information, we can't choose this option.

• Stimulants: These are drugs that increase brain activity. They are more likely to cause agitation and prevent sleep than to induce sleep.

Step 3: Choose the best answer based on the analysis. In this case, the best answer is Depressants.