05/07/14 Sleep

• Stages of consciousness
• Sleep, Hypnosis, Sleep
• Sleep
• State of consciousness
• We are less aware of our surroundings.
• Conscious
• Subconscious
• Unconscious
• Why we daydream
• Help us prepare future events.
• Nourish our social development.
• Substitute for impulsive behavior.
• Fantasy Prone Personalities 
• Someone who imagines and recalls experiences with lifelike vividness and who spends considerable time fantasizing.
• Biological Rhythms
• Annual cycles- Seasonal variations (Bears hibernate, seasonal affective disorder.)
• 28 Days cycle- Menstrual Cycle
• 24 Hour cycle- Our circadian rhythm 
• 90 minute cycle- sleep cycle.
• Circadian Rhythm
• Our 24 hour biological clock.
• Our body temperature and awareness changes throughout the day.
• It is best to take a test or study during your circadian peaks.
• Sleep Stages
• There are 5 identifies stages of sleep.
• It takes about 90-100 minutes to pass through the 5 stages.
• The brain's waves will change according to the sleep stage you are in.
• The first four stages are known as NREM sleep.
• The fifth stage is called REM sleep.

1. Stage 1 of Sleep
• Kind of awake and kind of asleep.
• Only lasts a few minutes and you usually only experience it once a night.
• Eyes begin to roll slightly.
• Your brain produces theta waves (high amplitude low frequency/slow.)
2. Stage 2
• This follows stage 1. Sleep and is the "baseline" of sleep.
• The stage is put of the 90 minute cycle and occupies approximately 45- 60% of sleep more theta waves that get progressively slower. 
3. Stage 3 and 4
• Slow wave sleep
• You produce delta waves.
• If awaken you will be very groggy
• Vital for restoring body's growth hormones and good overall health. 
• May last 15-30 minutes.
• It is called "slow wave" sleep because brain activity slows down dramatically slower rhythm called "delta" and the height or amplitude of the waves increases dramatically.
• Contrary to popular relief, it is delta sleep that is the "deepest" stage of sleep (Not REM) and the most restorative.

• H is delta sleep that a sleep deprived person's brain craves the first and foremost. 
• In children, delta sleep can occupy up to most 40% of all sleep time and this is what makes children unwakeable or "dead asleep" during most of the night. 

• REM Sleep
• Rapid Eye Movement
• Often called paradoxical sleep.
• Brain is very active
• Dreams usually occur in REM.
• Body is essentially paralyzed.
• Composes 20-25% of a normal nights sleep.
• Breathing, heart rate, and brain wave activity quicken.
• Vivid dreams can occur.
• From REM, you go back to stage 2.