5. Sleep in a cold room.

Your body cools down naturally during sleep, so a lower room temperature will support your sleep as much as possible. Switch off your heating at night, as it might leave you waking up at night feeling overheated. Leave your window ventilation open, even in winter, to allow fresh air and oxygen to enter the room. The ideal room temperature for sleeping is recommended to be 12 degrees Celsius (54 F), while other experts claim a temperature between 60 – 65F is ideal.

5.睡眠时温度宜低

你的身体在睡眠时会自然变凉，所以低温环境对你的睡眠有益无害。晚上关掉暖气，防止傍晚过热醒来。即使在冬天也要打开窗户，保持室内空气流畅。睡觉时理想的室内温度是12摄氏度（54华氏度），也有一些专家建议在60--65华氏度间。