Sunan An-Nasa'i

It was narrated from Sa'eed bin Jubair, from a man who he thought was good, that :Aishah, may Allah (SWT) be pleased with her, told him that the Messenger of Allah (ﷺ) said: ""There is no man who habitually prays at night, then sleep overwhelms him, but Allah (SWT) will record for him the reward of his prayer, and his sleep is a charity given to him