Well, if the office is closed, he may sleep at his desk; if some are functioning, its not proper to sleep in the office.
Question should have been as below:
Can sleeping in/during lunch break be a misconduct?
or
Is sleeping in/during lunch break a misconduct?
This is the second thread in today's newsletter with Can & is.
Just thought to tell you, I am not a scholar in English though.
regards,
Salahduheen