Your day job, even if it's at night, is your regular job - the one you normally do and the one that pays the bills.
So why would you give it up?
You might do if you believed you had great talent and one day would be a rich and famous singer.
On the other hand, you might just be delusional and receive the harsh but honest advice -
"Don't give up your day job."
Now marvel at some passionate but misguided people who really shouldn't give up their day job.
For idiom books visit the Praski Publishing website.