Which of the following is a common myth about sleep?

Napping is often thought to be detrimental, but this is a myth. In reality, napping can be beneficial for many individuals, depending on factors like the duration and timing of the nap. Short naps, typically lasting from 10 to 30 minutes, can enhance alertness, improve mood, and increase cognitive performance without leading to sleep inertia or negatively impacting nighttime sleep.

On the other hand, longer naps, especially if taken late in the day, might disrupt the natural sleep cycle and could lead to grogginess upon waking, but this doesn't mean napping is inherently bad. Instead, it highlights the importance of understanding personal sleep needs and patterns.

Addressing the other choices: it's not accurate to say that everyone requires the same amount of sleep, as sleep needs can vary widely amongst individuals based on age, health, and lifestyle. Also, while it is often believed that older adults require less sleep, they generally still need about 7 to 8 hours, although their sleep patterns and quality may change. Finally, while daytime sleep can be restorative, it is not universally restorative for everyone, as individual responses to sleep can differ significantly.