It doesn't matter. You sleep on your side. In fact, the key is not to have too frequent facial activities and exaggerated expressions within six hours after playing, to avoid getting wet, lying on your back, rubbing your face, avoiding drug diffusion or drug failure, and not to eat seafood, hard food, irritating food, drinking or smoking within one week after playing. Better pay attention. It's normal for your face to get sour in a few days, which means it's effective and the masseter muscle has begun to shrink. If your masseter muscle is large, the effect may be more obvious if you hit 100 units. I've been calling for half a month, but people don't understand that the effect is different. Some people didn't see the effect until a month later, while others saw it in three or two days. The key is to see if your masseter muscle is sensitive to that drug.