Why is the inquirer's feeling of laziness, lethargy, and excessive sleepiness limited to work hours only, and could that be sorcery?

It is not within the scope of this website to determine if a person is bewitched. However, legal ruqyah (definition) is prescribed for the Muslim, whether afflicted or not. It is recommended to seek refuge in Allah from helplessness and laziness, to adhere to the obligatory duties and avoid sins, and to persistently recite the prescribed supplications and seek refuge. It is also advised not to sit for long periods while working, to stand up and move when feeling lazy, and to perform Duha prayer or a supererogatory prayer before Dhuhr. Permissible stimulants such as tea may be used, and specialists in psychological and physical medicine may be consulted.