1. While You were Sleeping…

2. The __________ system is a system in the body which sends ___________ around the body.
It lets people and animals respond to what is around them.
The ______ is like a computer that controls the body's functions, and the nervous system is like a network that relays ______________ to parts of the body. 

3. What are neurons?
Neurons are the main type of _______ in the nervous system
also known as ___________________
Carry ____________ impulses
Basic _________of the brain

4. What are Brainwaves?
At the root of all our thoughts, emotions and behaviours is the _________________ between ____________________ within our brains.
Brainwaves are produced by_______________ electrical pulses from masses of neurons communicating with each other.
Brainwaves are detected using _____________ placed on the scalp

5. What are Brainwaves?
Think of them as a continuous spectrum of consciousness; from ______________________________- to ______________________________________________
It is a handy analogy to think of brainwaves as musical notes - the low frequency waves are like a deeply penetrating drum beat, while the higher frequency brainwaves are more like a subtle high pitched flute.
- images showing examples of the different brain waves

6. Circadian Rhythm Our ___________ hour biological clock.
designed to regulate feelings of _______________ and wakefulness over a 24-hour period.
This complex timekeeper is controlled by an area of the brain that responds to __________, which is why humans are most alert while the sun is shining and are ready to ___________ when it’s dark outside.
This is called the SCN

7. Circadian Rhythm
Most people feel the strongest desire to sleep between 1:00pm and 3:00pm (a.k.a. the post-lunch, afternoon crash) and then again between 2:00am and 4:00am, but this can vary from person to person.
That’s why some people are “morning people,” while others function best in the evening.
If you follow your body’s natural cues regarding when to go to sleep and wake up, your ____________________should stay balanced, but a change in your schedule (like if you stay up late pulling long hours with friends one day or sleep in one Saturday), can disrupt your ___________________.

8. The Master Timekeeper
a group of about _________ nerve cells (neurons) that form a structure called the suprachiasmatic __________, or SCN.
The SCN is
located in a part of the brain called the _______________and receives direct input from the _________

9. How do we know to go to sleep?
When it gets dark, the ________detects failing light, and triggers the _____________
The SCN triggers the ________________which creates and releases the hormone ______________
This is a key ____________________ for sleeping
The level of melatonin gradually increases, reaching its peak in the _______of the ________ in natural circumstances9.

10. The Master Timekeeper
Melatonin is not a sedative, but is a cue for innate _______________ behaviour.
In the morning, your retina is triggered by ________, which causes the _________to alert the ______________to stop making ______________
It is melatonin that causes your body to _______ down, to reduce ______, etc.

11. Sleep Stages
If you sleep for 8 hours a day, you will on average get 2 hours of ________ sleep, 2 hours of _______ sleep and 4 hours of __________ sleep.
There are 4 identified ________ of sleep (used to be 5).
The sleep stages replace each other in phases of approximately _________ hours, and most people repeat it ________ times during the night.

12. Sleep Stages

13. Feel like you’re __________? Movements slowing? Eyes rolling slightly?
Stage 1
Feel like you’re __________?
Movements slowing?
Eyes rolling slightly?
YOU ARE IN ________ (or N1) SLEEP

14. STAGE 1 “falling asleep” – transition between awake and asleep
lasts between __________ minutes – no more than 7 minutes
Less than _______ of a normal night of sleep.
Brain waves: begin to _______from waking brain waves

15. YOU ARE IN ____________ (or N2) SLEEP
Stage 2
Heartbeat and breathing slow
Muscles _________ more
Body temp __________
Eyes stop moving
YOU ARE IN ____________ (or N2) SLEEP

16. STAGE 2 A light sleep Spend __________in this stage than any other
__________of a normal night of sleep.
Brain waves: slow down but _______ at times – might be involved in ____________________ formation

17. YOU ARE IN _________ (or N3) SLEEP
Stage 3 (and 4)
______________ and ___________slow the most in this stage
Muscles very ______________
May be difficult to ________ you
YOU ARE IN _________ (or N3) SLEEP

18. Stage 3 (and4)
This is the _____________ that you need to feel refreshed in the morning
Occurs in longer periods during the __________of the night. 
Brain waves: slow down even more

19. YOU ARE IN ______ SLEEP REM Sleep
REM: _______________________ – eyes move _________ during this stage
Body becomes relaxed and immobilized – you are _____________!
This is because of 2 different _________________ that are produced in the brain
_____________________ occur
YOU ARE IN ______ SLEEP

20. REM Sleep This is a very ______stage of sleep.
Composes __________ of a normal night’s sleep.
Breathing, _________and _____ wave activity quicken.
‘______________can occur.
From REM, you go back to _____________