Can I do dhikr while lying down?
Yes. Dhikr is permitted in any posture. The Quran in Surah Al Imran 3:191 commends those who remember Allah standing, sitting, and lying on their sides.
Detail
There is no required posture for dhikr. Standing, sitting, walking, and lying down are all valid.
Bedtime dhikr is a Sunnah of its own. Reciting Ayatul Kursi, the last two verses of Surah al-Baqarah, and saying subhanallah 33, alhamdulillah 33, allahu akbar 34 before sleep is well attested.
This makes dhikr accessible during illness or fatigue, and it removes the excuse of "I do not have energy right now."
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