Your thermal environment, especially surrounding your head and body, is perhaps the most underappreciated factor determining not only the ease with which you'll fall asleep tonight, but also your sleep quality.

你周边的热环境，特别是头部和身体周围，可能是最被低估的因素，它不仅决定了你今晚入睡的难易程度，还决定了你的睡眠质量。