Studies show that for troubled sleepers, a cool room and a hot-water bottle placed at the feet, which rapidly dilates blood vessels, can push the internal thermostat to a better setting.

• 研究表明，对失眠者而言，凉爽的房间加上在脚旁放一个装有热水的瓶子可将身体内部温度控制器设置在较好的值上，而装有热水的瓶子可迅速扩张血管。