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burn the midnight oil 

To stay up all night working. Apparently some drop the "the", though this must be rare.
Man Bob, you must have really burned the midnight oil on this one!

burning the midnight napalm

Spending all night partying, clubbing, drinking, dancing, etc. Goes beyond burning the midnight oil, and requires at least one day of recovery.
-Where's Drew? I haven't seen him since Thursday night!
-Yeah, he was burning the midnight napalm all weekend.
-That explains all the empty MGD cans.

burning the midnight oil 

To do hard drugs(cocaine, heroin meth, etc)

Pumping the Midnight Iron 

Man, it's been a rough night. Time to go pumping the midnight iron.

burning the midnight oil 

Make coffee to stay awake
Boil some water, I'll be burning the midnight oil and I take my coffee black.

Burning the midnight owl

When you do stay up way too late and do Duolingo lessons. This can refer to you doing too many lessons and staying up late as a consequence or doing lessons only moments before midnight.
Person A: Why is Jenny on her phone at the party?
Person B: It's almost midnight abd she doesn't wanna lose her streak. She's burning the midnight owl.

Person C: Why are you still awake at 3 am?
Person D: I got hung up on my Doulingo lessons. You know, burning that midnight owl.