american
asleep
boring
boy
child
children
class
classmate
classroom
closed
cognition
copybook
desk
educating
elementary
european
eye
fatigue
indoors
kid
knowledge
learn
learning
lesson
lifestyle
nap
notebook
person
primary
pupil
russian
school
schoolboy
schoolchild
schooling
sick
sitting
sleep
sleepy
stress
student
study
studying
tedious
tired
upset
weary
young