It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Every night there is certainly a moment which, if a Muslim servant attains it and asks Allah for anything in supplication during it, his supplication will surely be accepted, and this is in every night.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 14746
Hadith Gradingحکم دارالسلام:حديث صحيح، م: 757، وهذا إسناد ضعيف من أجل ابن لهيعة وقد توبع، وفيه عنعنة أبى الزبير وقد توبع أيضا