Inshallah Quaimul Lail (Night Prayer)bInshallah Qiamul Lail (in English refers to Night Prayer) will start from the end of the second week of Ramadan till the 29th. Qiamul Lail refers to the act of waking up at night and performing prayer other than the obligatory prayer.
Allah says in the Holy Qur'an,
"And establish prayer at the two ends of the day and at the approach of the night. Indeed, good deeds do away with misdeeds. That is a reminder for those who remember." (Hud: v.114)