How are missed prayers, due to sleep or other reasons, numbering in the sixties or seventies, to be made up, bearing in mind the necessity of maintaining order between the two shared times, and how can their performance be reconciled with the performance of current prayers?

Abandoning prayer is one of the gravest sins. The cure for obsessive whispers (waswasah) is to disregard them. Regarding prayers missed intentionally, there is a difference of opinion on the obligation of making them up. However, prayers missed due to sleep or forgetfulness must be made up. It is advisable to observe the proper order when making up missed prayers to avoid disagreement.