can't really pray if ill or medication making you sleepy, read other exemptions.
Each daily prayer has a different number of obligatory rakats:
- Fajr — The dawn prayer: 2 rakats Sunnah, 2 rakats Fard
- Dhuhr — The midday or afternoon prayer: 4 rakats sunnah, 4 rakats fard, 2 rakats sunnah, 2 rakats nafl
- Asr — The late afternoon prayer: 4 rakats sunnah, 4 rakats fard
- Maghrib — The evening prayer: 3 rakats fard, 2 rakats sunnah, 2 rakats nafl
- Isha — The night prayer: 4 rakats sunnah, 4 rakats fard, 2 rakats sunnah, 2 rakats nafl, 3 rakats witr, 2 rakats nafl