1
Circadian rythm
Cyclical changes that occur on a roughly 24 hour basis in many biological processes
Image
2
Biological clock
Term for the area of the hypothalamus that is responsible for controlling our level of alertness
Image
3
Sleep debt
Missing sleep takes a toll on your body and must be made up
Mental effects: mild depression, difficulty learning new information, problems paying attention, problems Image
thinking clearly, and slowed reaction time
Physical effects: weight gain, high blood pressure, diabetes, and heart problems
4
Stage 1 of sleep
Brain activity powers down by 50% or more creating theta waves. Lasts about 5-10 minutes. (light sleep "no I
wasn't actually sleeping") Image
, 5
Stage 2 of sleep
Brain waves slow down even more. As brain activity decreases, heart rate slows down, body temperature
decreases, muscles relax, and eye movements cease. About 65% of the sleep cycle is in stage 2 Image
6
Stages 3 and 4 of sleep
Image
7
Stage 5 of sleep
REM (Rapid Eye Movement) sleep. Brain is most active during this stage, creating vivid dreaming. Lasts about
10-20 minutes (20-25%) before the cycle repeats Image
8
Paradoxical Sleep
Sometimes what REM sleep is called because the brain is active, yet the body isn't. (The sleeper is paralyzed
during REM, otherwise they'd act out their dreams) Image
Circadian rythm
Cyclical changes that occur on a roughly 24 hour basis in many biological processes
Image
2
Biological clock
Term for the area of the hypothalamus that is responsible for controlling our level of alertness
Image
3
Sleep debt
Missing sleep takes a toll on your body and must be made up
Mental effects: mild depression, difficulty learning new information, problems paying attention, problems Image
thinking clearly, and slowed reaction time
Physical effects: weight gain, high blood pressure, diabetes, and heart problems
4
Stage 1 of sleep
Brain activity powers down by 50% or more creating theta waves. Lasts about 5-10 minutes. (light sleep "no I
wasn't actually sleeping") Image
, 5
Stage 2 of sleep
Brain waves slow down even more. As brain activity decreases, heart rate slows down, body temperature
decreases, muscles relax, and eye movements cease. About 65% of the sleep cycle is in stage 2 Image
6
Stages 3 and 4 of sleep
Image
7
Stage 5 of sleep
REM (Rapid Eye Movement) sleep. Brain is most active during this stage, creating vivid dreaming. Lasts about
10-20 minutes (20-25%) before the cycle repeats Image
8
Paradoxical Sleep
Sometimes what REM sleep is called because the brain is active, yet the body isn't. (The sleeper is paralyzed
during REM, otherwise they'd act out their dreams) Image
