大学英语10分钟presentationppt课件

.
4
What happens when we sleep?
.
5
NON-REM SLEEP
.
6
.
7
REM SLEEP
• The first rapid eye movement (REM) period usually begins about 70 to 90 minutes after we fall asleep.
Species Python巨蟒
Average total sleep time per day
18 hrs
Tiger
15.8 hrs
Cat
12.1 hrs
Chimpanzee黑猩猩
9.7 hrs
Sheep
3.8 hrs
African elephant
3.3 hrs
Giraffe长颈鹿
1.9 hr
.
.பைடு நூலகம்
1
WHAT’S YOUR DAILY RHYTHM ?
• Do you consider yourself a morning person or an evening person ?
• At what time of day do you feel at your best?
• Considering only your own "feeling best" rhythm, if you were entirely free to plan your day — at what time would you get up and go to bed?
.
3
WHAT WOULD HAPPEN IF WE DIDN'T SLEEP?
• With continued lack of sufficient sleep, the part of the brain that controls language, menmery, planning and sense of time is severely affected, practically shutting down.
.
11
Thanks for your watching !
.
12
.
2
Why do we sleep ?
•
We have to sleep because it
is essential to maintaining
normal levels of cognitive
skills , such as speech, memory,
innovative and flexible thinking .
9
A HARD NIGHT'S SLEEP
apnoea
Snoring
disorder s
insomni a
Restless leg
syndrome
.
10
SLEEP TIPS AND ADVICE
Exercise regularly
Avoid coffeine
advice
Relax mind
Avoid alcohol
• Sleep deprivation not only has a major impact on cognitive functioning , but also on emotional and physical health. Moreover , it’ll arouse disorders such as sleep apnoea and the risk of obesity.
• We have around three to five REM episodes a night.
.
8
HOW MUCH SLEEP IS REQUIRED?
People like to sleep anywhere between 5 and 11 hours, with the average being 7.75 hours.