Passage 5
Scientists suggest that today, most adult get up to two hours' less sleep than they need.
As a result (hence), those lacking in sleep are forgetful, tired, less productive and grumpy(irritated).
Sleep is the time when our bodies and minds are rested and restored.
There are two types of sleep: Rapid Eye Movement and Non-REM.
We need both types to be healthy.
Rapid Eye Movement sleep is when we dream.
Our brains are active, and our eyes have fast short movements, as if watching something.
This type of sleep helps restore our mind.
Non-REM sleep is when our brain and body slow down.
Our heart rate slows and our breathing is regular.
This type of sleep helps restore our body.
We have twice as much Non-REM sleep as Rapid Eye Movement sleep each night.
To get better sleep, have a regular time for sleeping and a routine before you go to bed.
This will give your body the signal that it is time to sleep.
Make sure the bed and bedroom are quiet and comfortable.
If your bed is too hard or too soft, if you are too cold or too hot, you will not sleep well.
For two hours before going to bed do not drink coffee or alcohol, or do not smoke or exercise.
All these activities stimulate your body and make sleep difficult.
"别把最好的时光，浪费在无畏的等待和犹豫不决中。"