In the summer the time of isha is 11:30 and fajr is like 3:30 in our country. In this period I stay awake till fajr because it is too difficult for me to get to sleep. I make use of this time to do qiyaam layl one hour before fajr, but I have istihadha and incontinence of gas. Can I perform Qiyyamul-Layl with the wudhu of isha prayer? May Allah bless you.
Sheikh Ibn Al-Uthaymeen replied to a similar question saying:
The woman who has istihadha or a person who has urine incontinence should make wudhu for each prayer after the time of the prayer enters and this wudhu will be valid till the time of the next prayer, i.e till the time of the present prayer is out.
He said there is ikhtilaf regarding praying Qiyyamul-Layl after the middle of the night with the wudhu of Ishaa. Some Scholars say the Wudu is valid only till midnight then you have to renew your wudu and others say that the wudu is valid till time of fajr enters. Sheikh Ibn Al-Uthaymeen said that the correct opinion (ar-rajeh, the strongest opinion) is that you can pray qiyyamul-Layl with wudu of Ishaa.