Step 1: Understanding sedatives and stimulants.
- Sedatives are drugs that calm the body and reduce anxiety or stress, often inducing sleepiness or relaxation. They reduce alertness and energy levels.
- Stimulants, on the other hand, are drugs that increase alertness, energy, and focus, and can reduce the feelings of tiredness. These include caffeine, amphetamines, and certain other substances.
Step 2: Conclusion.
Since the question asks about drugs that reduce tiredness and increase alertness, the correct answer is stimulants.