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.
即便如此，大多数从业者还是认同我们按时交付特定软件而不超出预算的能力仍有待大幅提高。
Even so, most practitioners would agree that our ability to deliver appropriately featured working software on time and within budget leaves a lot to be desired.
孩子可能生病，下一个晚上的雪，孩子不按时醒来等。
Kids get sick, snow falls overnight, kids don't wake up "on time" et cetera.
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