Wa alaikum assalam
None of the verses that you have kindly shared indicate that there is an instruction that one
should not sleep most of the night.
In fact, verse 73:20 is capturing a situation where the prophet and a party of the believers were awake most of the night in worship (i.e.
they were not sleeping most of the night), but God intervened to regulate their worship so as not to set unreasonable expectations or overburden His servants.
It is also noteworthy that verse 73:2 is addressed to the prophet specifically as was the expectation to read Tahajjud prayers (17:79)
[1].
However, the Isha prayer is performed in the night and of course, a regular nightly vigil
(beyond the prescribed prayers 50:40) is strongly recommended as is indicated by the other verses that you have kindly shared. Furthermore, any prolonged vigil that is undertaken will always be accounted for in the Kingdom of Heaven (51:17).
The key remains one of self-regulation, so as not to overburden oneself in a manner that other important / necessary tasks cannot be carried out.
I hope this helps, God willing
Regards,
Joseph
REFERENCE[1] THE TAHAJJUD PRAYERhttp://quransmessage.com/articles/tahajjud%20FM3.htm