Chapter 5
Get a hint
1. Describe stages 1-4 of the sleep cycle including brain waves and the kind of dreams associated with each stage.
Click the card to flip 👆
*Stage 1: Light sleep, 5-10 min.
-Brain waves: Brain activity powers down to 50% less or more, producing theta waves, occur 4-7 times per second. These waves are slower than the beta waves produced during active alert states, and the alpha waves produced when we are relaxed and quiet.
-Associated Dreams:
-Hypnagogic imagery-scrambled, bizarre, and dream-like images that come in and out of consciousness.
-Myoclonic Jerks: sudden jerks of our limbs as if being started or falling.
*Stage 2: As are brain activity decelerates, our heart rate slows, our body temperature decreases, our muscles relax even more, and our eye movement ceases. We spend as much as 65% of our sleep in this stage.
-Brain waves: Slow down even more. Sudden intense burst of electrical activity called sleep spindles of about 12-14 cycles per second, and occasionally sharply rising and falling waves known as K-complexes. First appear in the EEG. only appear when we sleep.
-Associated Dreams: None specified.
*Stage 3 and 4: After 10-30 minutes, light sleep changes to deeper slow-wave sleep. What makes you feel fully rested.
-Brain waves: Delta waves- Appear 20-50% of the time. More than half the time in stage 4. Only 1-2 cycles per second.
-Brain waves: Brain activity powers down to 50% less or more, producing theta waves, occur 4-7 times per second. These waves are slower than the beta waves produced during active alert states, and the alpha waves produced when we are relaxed and quiet.
-Associated Dreams:
-Hypnagogic imagery-scrambled, bizarre, and dream-like images that come in and out of consciousness.
-Myoclonic Jerks: sudden jerks of our limbs as if being started or falling.
*Stage 2: As are brain activity decelerates, our heart rate slows, our body temperature decreases, our muscles relax even more, and our eye movement ceases. We spend as much as 65% of our sleep in this stage.
-Brain waves: Slow down even more. Sudden intense burst of electrical activity called sleep spindles of about 12-14 cycles per second, and occasionally sharply rising and falling waves known as K-complexes. First appear in the EEG. only appear when we sleep.
-Associated Dreams: None specified.
*Stage 3 and 4: After 10-30 minutes, light sleep changes to deeper slow-wave sleep. What makes you feel fully rested.
-Brain waves: Delta waves- Appear 20-50% of the time. More than half the time in stage 4. Only 1-2 cycles per second.
Click the card to flip 👆
