The time for Isha prayer is up until midnight. If someone genuinely forgot to offer it and remembered after midnight, they should offer Isha immediately. Similarly, if someone fell asleep and Isha time passed, and woke up after midnight (not intentionally), they can offer Isha when they awake at night. However, if Isha prayer was missed for no reason and merely out of laziness and on purpose, then apart from seeking Allah’s forgiveness, there is no recompense.