The ruling on voluntary fasting if it leads to negligence in obligatory duties

Your Eminence! This message reached us from Kuwait from the listener Isa ibn Ali ibn al-Mu'taq. He says in his message: Peace be upon you, and Allah's mercy and blessings. After that:
On last Monday, I was fasting a voluntary fast. When I came home from school, I slept because I was tired and exhausted before I prayed the 'Asr prayer, as its time had not yet entered. However, I woke up after the 'Isha' prayer, so I broke my fast and then prayed 'Asr, Maghrib, and 'Isha' as make-up prayers. Is this action permissible, or should I have prayed first and then broken my fast? And what is the ruling on my fasting and prayer in this situation?
Answer: In the name of Allah, the Most Gracious, the Most Merciful. Praise be to Allah, and blessings and peace be upon the Messenger of Allah, and upon his family and his Companions, and upon those who follow his guidance.
After that: Allah, Glorified and Exalted is He, has prescribed voluntary fasting for His servants because of the great good and numerous benefits in fasting. If fasting—meaning voluntary fasting—leads to weakness and severe fatigue such that a person misses his prayer in its time and his prayer in congregation, then in this case he should leave the fasting that weakens him from what Allah has made obligatory, and he should occupy himself with what Allah, the Exalted and Exalted, has made obligatory. He should not fast unless there is energy and strength for fasting that does not result in negligence in what is obligatory.
And what you did, O questioner, by sleeping before 'Asr and not waking up until after 'Isha', then breaking your fast, then praying 'Asr, then Maghrib and 'Isha', all of that is permissible. And hastening to break the fast is better so that you may be energetic for worship. Also, this is in accordance with the Sunnah, for the Sunnah is to hasten to break the fast after the sun sets. However, you should not sleep in such a situation unless you have set an alarm to wake you at the time of prayer, meaning an alarm clock, or you instruct those around you from the household to wake you when the time enters. Do not be lax in this matter, for laxity is considered negligence in what Allah, the Exalted and Exalted, has made obligatory. It is not permissible for a believer to be negligent in performing the obligatory duties; rather, it is obligatory for him to be cautious and to care for what helps him in performing the obligatory, such as prayers and others. If a person is likely to be overcome by sleep if he sleeps after the midday prayer, he should set an alarm clock at the time to wake him for prayer. And so in the night, if he fears that he will not get up from the last part of the night for the Fajr prayer, he sets an alarm clock to help him get up at the time. And everything without which the obligatory is not completed is itself obligatory.
So performing the prayer in its time is a necessary matter and an obligatory matter. If a person's sleep is heavy and he fears missing the time or missing the prayer in congregation, then he does what he can of what helps him in performing the prayer in its time and in performing it in congregation, such as having an alarm clock set for the appropriate time, or having an alarm from his family that wakes him at the time of prayer, so that he does not be negligent in what Allah has made obligatory, and so that he does not fall into the prohibitions of Allah, the Exalted and Exalted.
And upon you is repentance and seeking forgiveness for your negligence. This is a type of negligence, so you must seek forgiveness from Allah and repent to Him with regret for what has passed, and with a sincere resolve not to return to such negligence. And we ask Allah for success and guidance for us and for you.