How do you know? Honest question. There's no detail in your question, so, how do you know this guy isn't waking up at 3am where he's at his most productive and

How do you know? Honest question. There's no detail in your question, so, how do you know this guy isn't waking up at 3am where he's at his most productive and does double the work you do? And then wastes time at the office because of silly punchcard rules?