Sleep is given a purpose in the text, not treated as lost time
Worth setting down at the start, because a lot of Muslim material treats sleep as the thing subtracted from worship.
The Qur'an does not treat it that way. Sleep is described as rest, the night is described as a covering, and your sleeping by night and by day is listed among the signs. It is given a function, and a good one. That framing does real work later in this course, because it means protecting your sleep is not a concession you are extracting from your religion.
Qur’an and Sunnah
وَهُوَ ٱلَّذِي جَعَلَ لَكُمُ ٱلَّيۡلَ لِبَاسࣰ ا وَٱلنَّوۡمَ سُبَاتࣰ ا وَجَعَلَ ٱلنَّهَارَ نُشُورࣰ ا
It is He who made the night a garment for you, and sleep a rest, and made the day like a resurrection
Qur’an 25:47
وَمِنۡ ءَايَٰتِهِۦ مَنَامُكُم بِٱلَّيۡلِ وَٱلنَّهَارِ وَٱبۡتِغَآؤُكُم مِّن فَضۡلِهِۦٓۚ إِنَّ فِي ذَٰلِكَ لَأٓيَٰتࣲ لِّقَوۡمࣲ يَسۡمَعُونَ
Among His signs are your sleep, by night and by day, and your seeking His bounty. There truly are signs in this for those who can hear
Qur’an 30:23
وَجَعَلۡنَا نَوۡمَكُمۡ سُبَاتࣰ ا
give you sleep for rest
Qur’an 78:9
Translation: M.A.S. Abdel Haleem, The Qur'an, Oxford University Press, 2004.