This question was asked earlier (not by me), but closed and deleted by a mod. But I thought it was interesting, because I didn't know the answer. So I'm reposting it....
The verb phrasal 'draw on' seems to have two conflicting definitions:
to come closer in time "It became colder as night drew on."
(of a period of time) pass by and approach its end:
"he remembered sitting in silence with his grandmother as evening drew on"
How is 'draw on' used by native speakers?
...that's the original. Here's my own additional research from OED:
draw B.VI.70 To draw near or approach in time.
draw in B.VII.82.f Of a day or evening: To draw to a close, to close in. Also of a succession of evenings in late summer and autumn: To become gradually shorter (as if contracting or shrinking in).
draw on B.VII.86.d To advance, approach, draw nigh.
86.e To draw near to death, be in a dying state.
So, to restate the original question, which of these does as night drew on mean? (I've no idea!)
1 as night approached
2 as night passed
3 as night drew to a close