´It was narrated that Ibn 'Abbas said:` "The Messenger of Allah used to pray in the night (Qiyamul-Lail) two Rak'ah by two, then when he finished he would use the tooth stick."
Hadith ReferenceSunan Ibn Majah / The Book of Purification and its Sunnah / Hadith: 288
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:ضعيف, إسناده ضعيف, وانظر الحديث الآتي (1321), سليمان الأعمش مدلس وعنعن, انوار الصحيفه، صفحه نمبر 386