Is it permissible to delay the Asr and Maghrib prayers and combine them with the Ishā prayer due to sleep and difficulty waking up, knowing that all prayers are performed at the workplace? And is it permissible to fast while sleeping from 2 PM to 6 PM?

Intentionally delaying prayer until its time has expired is one of the gravest sins. A Muslim must take the necessary measures to wake up for prayer, but if sleep overtakes him, there is no sin upon him. It is permissible to pray at the workplace, and it is recommended to be diligent in performing congregational prayer. As for sleeping during the day while fasting, it does no harm and does not affect the validity of the fast.