Physical exertion too close to bedtime energizes your body’s systems by stimulation the release of adrenaline.
临睡前的剧烈活动会刺激肾上腺素的释放，从而使身体充满活力。
2
The volunteers who held hands "reported less physical pain than when they were holding a stranger's hand or a ball while receiving the same amount of heat stimulation".
志愿者们声称，受到同等热刺激时，握住伴侣的手比握住陌生人或攥球时痛感要轻。
3
Says Kennedy: "As with physical exercise, what kind and how much cognitive stimulation is going to be right without doing injury?