The Prophet ﷺ delayed the night prayer one night until most of the night had passed and until the people in the mosque had fallen asleep. Ibn Bakr's version says, "had gone to sleep." Then he came out and prayed, and he said, "This is indeed its proper time, were it not that it would be a hardship on my community." Ibn Bakr's version says, "that I would impose hardship."
حدثنا عبد الرزاق ومحمد بن بكر قالا أنا ابن جريج أخبرني المغيرة بن حكيم عن أم كلثوم بنت أبي بكر أنها أخبرته
أعتم النبي ﷺ ذات ليلة حتى ذهب عامة الليل وحتى نام أهل المسجد وقال ابن بكر رقد ثم خرج فصلى فقال إنه لوقتها لولا أن يشق على أمتي وقال ابن بكر أن أشق
Its isnad is sahih. Mughira bin Hakeem is al-Sanani, and he is trustworthy, his hadith appears in Muslim. The hadith was narrated by Muslim 1/442 no. 638, Nasai 1/267 no. 536, Darimi 1/229 no. 1214, and Ibn Khuzayma 1/179 no. 348, all of them in the Book of Prayer.