Adab al-Zifaf fi al-Sunnah al-MutahharahNasir al-Din al-Albani
16
Bathing before going to sleep is preferable. Indeed, it is even better if both spouses bathe, as borne out by the hadith narrated by ʿAbd Allāh ibn Qays, who said:
١٣- اغتساله قبل النوم أفضل:
واغتسالهما أفضل لحديث عبد الله بن قيس قال: