I would like to know whether a person who is in a state of post-sex impurity,could make supplications and zikrullah. (esp. Those recommended before going to bed).
Praise be to Allah.It is permissible for a person, if he is junub, to make du`a to Allah and remember Him, including the adhkaar before sleeping and others, because of what is reported in the hadith of ‘Aa’ishah (may Allah be pleased with her), who said, “The Messenger of Allah (peace and blessings of Allah be upon him) used to remember Allah in all circumstances.” (Narrated by Muslim, al-Hayd, 558). Some of the commentators on this hadith said: this hadith is stating a basic principle, which is the remembrance of Allah in all circumstances, even when one is in a state of minor or major impurity. Dhikr in the form of tasbeeh (saying ‘Subhaan Allah’), tahleel (saying ‘Laa ilaaha ill-Allah’), takbeer (saying ‘Allahu akbar’), tahmeed (saying ‘al-hamdu Lillaah’) and other similar adhkaar is permissible in all situations, according to the consensus of the Muslims. What is forbidden is dhikr that consists of reciting Quran, a full aayah or more, whether that is read from the Mus-haf or recited by heart, because the prohibition of doing so has been narrated. But it is mustahabb for the person who is junub to wash his private parts and do Wudu when he wants to go to sleep, because of what is stated in the hadith of ‘Umar (may Allah be pleased with him), who said, “O Messenger of Allah, may one of us sleep when he is junub?” He said, “Yes, if he does Wudu.” (Narrated by al-Bukhaari, al-Ghusl, 280)
See al-Sharh al-Mumti’ by Ibn ‘Uthaymeen, 1/288; Tawdeeh Ahkaam by al-Bassaam, 1/250; Fatawa Islamiyyah, 1/232