Final answer:
Alcohol will have a synergistic effect with hypnotics and sedatives, leading to increased sedation and respiratory depression.
Step-by-step explanation:
Alcohol will have a synergistic effect with hypnotics and sedatives, which means that when alcohol is taken together with these substances, their effects can be magnified and intensified. For example, when barbiturates (a type of sedative) are taken in overdose with alcohol, the combined CNS depressant effects can be even more dangerous, leading to increased sedation and respiratory depression.