Boyfriend several times a week will take 3 hours to text back saying he "took a nap." Is this a bad sign?

Anonymous
He and I only see each other on weekends. On weekdays he texts me after he gets off work and then goes silent for 3 or 4 hours. At 10 pm he texts and says he took a 3 hour nap. He did this again last night and texted good night. Should I be concerned?
Boyfriend several times a week will take 3 hours to text back saying he "took a nap." Is this a bad sign?
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