Whether you prefer a cotton, linen, or silk pillowcase depends on your personal preference. Each type of fabric has different pros and cons that might make it a better fit for you. Cotton is durable and soft, while linen is moisture-wicking and breathable. However, one downside to linen is that it tends to wrinkle easily. Silk pillowcases are smooth and gentle on the skin but can be more expensive than other options.
Residents of Japan and the United States get the least amount of sleep.