Body Clock

Your body clock controls the production of .... in your body.

• hormones

• oxygen

• thoughts

• temperature

Melatonin is the hormone that makes you feel ....

• energetic

• happy

• sleepy

• sad

Teenagers need about .... hours of sleep.

• 6

• 7

• 8

• 9

When you are a child, you wake up naturally at about ....

• 6 o'clock

• 7 o'clock

• 8 o'clock

• 9 o'clock

When you are a teenager, you wake up naturally at about ....

• 6 o'clock

• 7 o'clock

• 8 o'clock

• 9 o'clock

When you are a teenager, your natural time to go to sleep is ....

• 9 o'clock

• 10 o'clock

• 11 o'clock

• 12 o'clock

Modern technology such smartphones and computers makes teenagers sleep even less because ....

• the radiation from such devices increases the production of adrenaline

• the games in such devices are too addictive so they can't stop playing

• the bright light from such devices stop the production of melatonin

• the alarm in such devices keep them awake

It's harder for teenagers in the USA to stay awake in class because ....

• they need to wake up at 6 am and start school at 7.15 am

• they start school at 8.45 am and leave school late in the evening

• they have too many devices in their bedroom

• their school starts at 10 am

Some .... now think that the school day for teenagers should start at about 10 am.

• students

• teachers

• parents

• scientists