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To do something pointless or insignificant that will soon be overtaken by events, or that contributes nothing to the solution of a current problem.

shuffling the deckchairs in the Titanic

to make the grade

to perform well enough to succeed in something

to bite the bullet

to force yourself to do something unpleasant or difficult, or to be brave in a difficult situation: I hate going to the dentist, but I'll just have to bite the bullet.

to hit the hay/sack

to go to bed in order to sleep: I have a busy day tomorrow, so I think I'll hit the sack

to hit the nail on the head

to describe exactly what is causing a situation or problem: I think Mick hit the nail on the head when he said that what's lacking in this company is a feeling of confidence.

to burn the midnight oil

to work late into the night