Teenagers and sleep

to go to bed in time

to go out of bed in time

to play computer games until late at night

to go to school

Teenagers can't get out of bed in time for school because of their laziness.

Teenagers can't go to bed until late at night because of hormonal changes.

Teenagers can't go to bed until late at night because they have a lot of homework to do.

Teenagers can't get out of bed in time for school because they play computer games until late at night.

laziness

computer games

hormones

bad behaviour

It's extremely important for everybody.

It isn't extremely important for teenagers.

It's extremely important for adults.

It's extremely important for teenagers.

while they are eating

while they are sleeping

while they are in beds

while they are playing computer games.

hormonal changes

energy to get out of bed in time

to go to bed early

sleep

not to go to bed until late at night

a special hormone melatonin

hormonal changes

computer games and television

"laziness hormone"

"growth hormone"

"darkness hormone "

"night hormone"

at about 10 am

at about 10 pm

at 1 am

at 1 pm

the fact that teenagers release melatonin

the fact that teenagers can't get out of bed in time for school

the fact that teenagers play computer games and watch television late at night

the fact that teenagers can't go to bed until late at night

Teenagers are being kept awake by their bodies.

Teenagers produce melatonin at about 10 am.

Teenagers play computer games and watch television late at night.

Teenagers do not get enough sleep .

They have to get up early.

They have problems with growth.

They have bad mood.

They don't go to school.

to start classes at 10 am

to start classes in the afternoon

to start classes later in the morning

to start classes late at night