It's probably because he is not sleeping at night.
可能是因为晚上没睡觉累的吧。
It's common to feel too awake and alert after a good workout, so it would not be wise to workout at night if you already have trouble sleeping.
在经过锻炼之后，常见的症状是会保持清醒和警觉，因此如果在晚上你已经有睡眠困难，那么在晚上锻炼是不明智的。
Weekend sleep, is not too much time in 10 hours, and is better than before 12 o 'clock at night until the next day before 10:00, when sleeping, spirit relaxed.
周末补觉则不能太多，每晚睡眠时间掌握在10个小时以内，且最好是在晚上12点之前到第二天10点前，保证睡觉时，精神完全放松。
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