See the night split into its three classical thirds — first, middle and last — to plan your voluntary night prayer (Qiyam al-Layl) at your location.
Isha tonight
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Fajr tomorrow
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Qiyam al-Layl may be prayed at any point in the night after Isha, but the last third is the time of greatest virtue described in hadith. Even a short Qiyam, even two rakat before sleeping, is encouraged.