idioms

  a night owl (a person who enjoys being awake and active at night) I’m not a night owl. I usually go to bed before 11 p.m. He is a night owl and seldom go to bed until after midnight.     night owl – English Vocabulary

  monkey on your back  informal (a serious problem that makes your life difficult) The accusations of corruption remain a monkey on your back. (drug addiction)  informal He checked himself into rehab to deal with the monkey on his back.   monkey on back – English Vocabulary

  a mare’s nest (a very complicated or confused situation, a mess) The law on restrictive trade is a mare’s nest that nobody fully understands. (a discovery that seems interesting or important but turns out to be false or worthless) The box we found was a mare’s nest. All the …

a lone wolf (a person who likes to work or live alone) Although John is a lone wolf, we all like him very much. Nobody knows much about him; he’s rather a lone wolf.   lone wolf – English Vocabulary

  get your brain in gear (make yourself start to think in a clear and effective way so that you can deal with something) I have to get my brain in gear for this important exam. Get your brain in gear because we have to finish the project on time. …