"What measures can one take for prevention or improvement?"

• Provide optimal sleeping conditions: good bedding, well-aired bedroom, room temperature should not be too warm (14° - 18°C), maximum possible quiet and darkness.
• Researchers have discovered that high quality bedclothes (bed coverings, pillows, underbedding and bolsters) extend the period of sleep by 53 minutes per day.
• Keep regular sleeping times.
• During the day take healthy nourishment, adequate exercise and fresh air.
• Avoid indigestible foods and caffeine in the evening.
• Avoid heavy physical work or strenuous sports before going to bed as physical exertion stimulates the circulation.
• Relax before going to bed. Avoid watching thriller films or reading very exciting books. This applies particularly in the case of children.