About the time when my children learnt to sleep through the night, I lost the knack. Waking up tired is one of the quiet horrors of middle age. I’ve recently become addicted to my Fitbit watch, which tracks sleep, and my new first-thing ritual is to scan the dismal numbers from the night before: the hour-plus awake, the preponderance of light sleep and the struggle to reach seven hours.
大约在我小孩学会睡整宿的那段时间，我睡不着了。疲惫地醒来是中年人的无声恐惧之一。我最近迷上了我那块可以追踪睡眠的Fitbit手表，于是我新的例行起床仪式是浏览头天晚上那些令人沮丧的数字：一个多小时醒着，浅睡眠占主，勉强睡到7个小时。
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