Is a person excused for delaying prayers or sleeping through them due to depression and heavy sleep, especially if their work conflicts with prayer times, taking into account their consumption of medications outside of the doctor's instructions and severe pangs of conscience?

Sleep is not negligence; rather, negligence is intentionally delaying the prayer until its time has expired. The expiation for one who sleeps through a prayer is to perform it immediately upon waking up. One who intends to sleep before the prayer time enters should take measures to wake up, such as setting an alarm. If he takes these measures, but sleep overwhelms him, and he wakes up after the prayer time has expired, he should pray immediately upon waking, and there is no sin upon him, because the Pen is lifted from the sleeper.