Ce sont les mots les plus souvent utilisés dans ce livre.
able
adults
although
animals
another
asleep
awake
bed
between
body
brain
cannot
cause
changes
chapter
child
clock
come
cortex
day
deep
deprivation
does
down
dreams
drivers
during
early
effect
especially
even
example
eye
few
first
found
get
go
good
having
help
hours
however
human
ing
insomnia
least
less
levels
light
likely
little
long
longer
loss
may
might
mind
minutes
morning
movement
need
night
normal
often
particularly
people
point
probably
problem
rather
really
reason
rem
see
seem
seen
shift
short
should
simply
sleep
sleepers
sleepiness
sleeping
sleepy
still
studies
take
tests
time
two
usually
wakefulness
waking
whereas
whether
without
work
years