Final answer:
Most adults should aim for 7-9 hours of sleep per night, as recommended by the National Sleep Foundation, to maintain good health and mental efficiency.
Step-by-step explanation:
The question is about how many hours of sleep most adults should get each night. Based on research and the guidelines provided by the National Sleep Foundation, the answer is that most adults should aim for 7-9 hours of sleep each night.
This amount is thought to be optimal for maintaining health and well-being, with insufficient sleep leading to a sleep debt, which can result in decreased alertness and mental efficiency. It's important to maintain a consistent sleep schedule, avoid stimulants before bedtime, and seek medical advice if persistent sleep difficulties occur.