This verse, "Their sides forsake their beds" [Sajdah 32:16], was revealed concerning waiting for the prayer that is called al-atamah.
بسم الله الرحمن الرحيم حدثنا عبد الله بن أبي زياد حدثنا عبد العزيز بن عبد الله الأويسي عن سليمان بن بلال عن يحيى بن سعيد
أن هذه الآية {تتجافى جنوبهم عن المضاجع} نزلت في انتظار الصلاة التي تدعى العتمة
[Its isnad is hasan]. Tabari also narrated it in his Tafsir 21/63, 64, from Abdullah bin Abu Ziyad, through the same route, and it has corroborating narrations in Abu Dawud, no. 1321, and elsewhere.