It is narrated from Hazrat Mu'adh (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: "The meaning of 'their sides forsake their beds' is that a person gets up at night for Tahajjud."
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22103
Hadith Gradingحکم دارالسلام:صحيح بطرقه وشواهده، وهذا إسناد ضعيف لضعف شهر، ثم هو لم يسمع من معاذ