Not a good idea. There are several abstractions between assembly language and modern programming languages. May not be worth learning it.
If you have lot of free time, I will recommend reading a book -- Inner engineering by Sadhguru. It talks about a lot of things and gives a perspective of who we are. I read it a month back. And love some of what is there in that book.
If you like to stick with science, there is another book, one of my favorite reads: QED - The strange theory of light and matter by Richard Feynman.
If you like videos, there is The Secret Life of Chaos presented by Jim Al-khalili
And if you still have free time, there is plenty of things to do. But learning assembly, hmmm, not good use of time.