alarm – n. a device that makes a loud sound as a warning or signal
shake off – v. an act of getting rid of something unpleasant or unwanted
grogginess – adj. not able to think or move normally because of being tired, sick
alert – adj. able to think clearly and to notice things
harsh – adj. unpleasant and difficult to accept or experience
tone – n. the quality of a sound produced by a musical instrument or singing voice
hum – v. to make a low continuous sound