Final answer:
Regular physical activity is related to longer sleep durations during the preschool years. It is a key part of maintaining good sleep hygiene, in contrast to other options like increased screen time or caffeine consumption before bedtime, which may disrupt sleep.
Step-by-step explanation:
Among the options provided, the one related to longer sleep durations during the preschool years is regular physical activity. There is substantial evidence indicating that physical exercise generally improves sleep quality and can help with sleep disorders such as insomnia. Regular physical exercise contributes to better sleep hygiene, which includes maintaining a consistent sleep schedule, engaging in daily exercise, and avoiding stimulating activities before bedtime.
Increased screen time, especially before bedtime, and consuming caffeine in the evening are both associated with poorer sleep quality and shorter sleep durations, as these activities can overstimulate the brain or disrupt the natural sleep-wake cycle. Similarly, an irregular sleep schedule disrupts the biological clock, making it harder for children to establish a routine that supports long, restful sleep.
Therefore, to promote healthier and longer sleep durations during the preschool years, it is recommended to encourage regular physical activity, maintain a consistent bedtime routine, and minimize screen time and caffeine consumption in the evening.