在广泛的遗传因子制约中，人类可以选择什么时候上床睡觉和起床。
Within broad genetic constraints, humans can choose what time to go to bed and get up.
我通常是在晚上儿子上床睡觉之后淋浴，这样早上家里人最忙的时候，我可以随叫随到。
I normally shower at night, after my son goes to bed, so I'm available during the morning rush in my house.
有睡眠问题的人通常会被建议每天在同一时间上床睡觉并且按时起床，在周末的时候也不例外。
People who have problem sleepiness are often advised to go to bed and get up at the same time every day, including on weekends.
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