Idiom: Keep Someone Up At NightCheck definitions of...keepsomeoneupatnightMeaningsto make someone disturbed (such that someone might not sleep well); to be watchful ofA-Z Proximitieskeep someone companykeep someone in the loopkeep someone on icekeep someone on their toeskeep someone posted keep someone up at night keep straightkeep tabs onkeep the ball rollingkeep the home fires burningkeep the peaceSimilar Idiomsnight in, night outkeep someone up at nightbank nightcall it a nightcreature of the nightday or nightdead of nightfly-by-nightmake a night of itnight outnight owlnight personone-night standthief in the nightkeep someone companykeep someone in the loopkeep someone on icekeep someone on their toeskeep someone postedSimilar Phrasesbreak someone's heartin someone's waypull someone's legsell someone outtake someone's sidekeep offkeep quietkeep stepkeep abreastkeep an eye onkeep apartkeep awaykeep backkeep companykeep downkeep goingkeep guardkeep inkeep in linekeep mum