1. SLEE P

2. SLEEP  1/3 of our lives are spent sleeping.  Many cultures have been fascinated with sleep and dreams. Many believe the universal truths are to be revealed in dreams.  Only recently have researchers began to study sleep.

3. Circadian Cycle (Circa Diem)  “ About a Day”  The time we spend awake and asleep depends on a 24 hr cycle influenced by the sun.  Sleep/Wake cycles change as the days grow shorter and longer with the seasons.  Melatonin increases as night comes.

4. Circadian Cycle  We do not even know these cycle exist unless they are disrupted.  Jet Lag, Day light Savings time.

5. SLEEP  WE NEED SLEEP!!!!!!  Some people say the never sleep it is a lie. They sleep in intervals of 1-2 seconds or fall asleep and do not know it.  When the body is sleep deprived it craves it like food.  Nobody is exactly sure why we need sleep.

6. SLEEP  Some believe that sleep restores effective functions of the body and brain.  S-Factor  A chemical which has been isolated from the brains of animals and from human urine, induces sleep when injected into the brain. But there is no evidence that a build up of the s-factor in the body.

7. SLEEP  Scientists study sleep in a sleep lab.  Each state of sleep is marked by a pattern of brain waves, muscular activity, blood pressure and body temperature.  Going to Sleep  means losing awareness and failing to respond to a stimulus that would produce a response in the waking state.

8. SLEEP  People in this twilight state with their eyes closed often report seeing flashing lights and colors, geometric patterns and visions and landscapes. Sometimes they also experience a floating or falling sensation, followed by a quick jolt back to consciousness.

9. STAGE 1  Stage 1  Wavelengths are very low and tight. They look like someone that is awake. But is a slow pulse and side to side movement of the eyes. Only lasts a few minutes. If woken the person may not believe they were even asleep.

10. STAGE 2 & 3  These are deeper sleep brain waves increase in amplitude and become slower. The sleeper is hard to awaken and does not respond to stimuli.

11. STAGE 4  Very slow delta waves. This lasts in 15-20 minute intervals interspersed throughout the first half of the night.  This decreases as morning comes.  After about 40-60 minutes the person ascends from stage 4 sleep to stage 1 sleep.

12. REM SLEEP  Rapid Eye Movement also called paradoxical sleep.  The mind works like a conscious state however the body cannot move. The body’s voluntary muscles are essentially paralyzed.  This makes REM Sleep safer for us.  The sequence of sleep stages repeats itself all night long from Stage 1 – REM to Stage 4 and back again.

13. SLEEP  Sleep patterns and characteristics change for everyone and as we pass through ages.