Unit 2

prone

likely to experience a particular problem more often than is usual

skip

to not do or not have something that you usually do or that you should do

optimum

best; most likely to bring success or advantage

immune system

the cells and tissues in the body which make it able to protect itself against infection

disquieting

causing worry

hormone

one of many chemicals made in your body that make the body grow and develop

surge

to increase very quickly

urge

to strongly advise an action

head start

an advantage that someone has over other people in something such as a competition or race

take a nap

have a short sleep, especially during the day

fall asleep

to start to sleep

lie in

to stay in bed later than usual in the morning

light sleeper

someone who is easily woken up

fast asleep

sleeping deeply

snore

to breathe in a very noisy way while you are sleeping

under the covers

in bed, under the bed sheets

nod off

to begin sleeping, especially not intentionally

exaggerated

making something ​seem ​larger, more ​important, ​better, or ​worse than it really is

well-being

when someone is healthy, happy, and comfortable

deprivation

the state of not having enough of something

cast

all the actors in a film, play or show

invade

to enter a place in large numbers

trigger

to make something begin to happen

paralysed

unable to move or act

limb

an ​arm or ​leg of a ​person or ​animal

sleep on it

to wait until the next day before making a decision about something important so that you can think about it carefully

lose sleep (over)

to ​worry about something

beyond sb's wildest dreams

to a ​degree or in a way you had never ​thought ​possible

never dream of

never consider

dream job

the ​perfect ​job that you ​want more than any other

dream come true

something you have ​wanted very much for a ​long ​time that has now ​happened

get (your) beauty sleep

the ​sleep that you need in ​order to ​feel and ​look ​healthy and ​attractive

in (your) dreams

something you say to someone who has just told you about something they are ​hoping for, in ​order to show that you do not ​believe it will ​happen

have a bearing on

to have an ​influence on something or a ​relationship to something

burst

a ​sudden ​increase in something, ​especially for a ​short ​period

fragmented

consisting of several ​separate ​parts

insomnia

the ​condition of being ​unable to ​sleep, over a ​period of ​time

commonplace

​happening often or often ​seen or ​experienced and so not ​considered to be ​special

ubiquitous

​seeming to be ​everywhere

commitment

a ​willingness to give ​your ​time and ​energy to something that you ​believe in, or a ​promise or ​firm ​decision to do something

undervalued

if something is undervalued, it is considered to be less ​valuable or important than it really is