第二个是自我平衡的过程，它调节闭眼的时间。
The second is a homeostatic process, which regulates the length of shut-eye.
当我们睡觉，睡眠长，通过系统的昼夜节律调节和自我平衡的系统管理。
When we sleep, sleep long, by regulation of circadian rhythm system and self-balancing system management.
当我们睡觉，睡眠长，通过系统的昼夜节律调节和自我平衡的系统管理。
When we sleep, sleep long, by regulation of circadian rhythm system and self-balancing system management.
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