Yes, I remember watching a health program on TV, in which an expert was invited to talk about taking a nap and said that I couldn't sleep well on my stomach. If you can't sleep on your stomach, sitting with your eyes closed 15 minutes is not bad. There seems to be another way to sit on seven legs, but your legs don't need a board, so you can sit vertically naturally. Other methods are based on seven-legged sitting. Then take a nap in winter and keep warm. Don't catch cold.