Unit 1- Sleep and Consciousness

Front

Consciousness

Back

Varying levels of awareness of thoughts, feelings, behavior, and events in individuals’ internal and external worlds. Sleep and wakefulness are two types of consciousness.

Front

Circadian Rhythm

Back

The sleep/wake cycle is a circadian rhythm, which in humans is about a 24-hour cycle.

Front

Stage (NREM) 1 Sleep

Back

Characterized by relatively rapid, low-amplitude brain waves.

Front

Stage (NREM) 2 Sleep

Back

Makes up about half of the total sleep and is characterized by a slower, more regular wave pattern.

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Stage 3 (NREM) Sleep

Back

The brain waves become slower, with higher peaks and lower valleys in the wave pattern. People are least responsive to outside stimulation.

Front

Rapid Eye Movement (REM) Sleep

Back

Several times a night, when sleepers have cycled back to a shallower state of sleep, their heart rate increases and becomes irregular, their blood pressure rises, and their breathing rate increases. Most dreams occur here.

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Activation-Synthesis Dream Theory

Back

Dreams are the brain's attempt to make sense of random neural activity that occurs during REM sleep. Dreams are essentially meaningless byproducts of this process.

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Consolidation Dream Theory

Back

Dreams play a role in solidifying and organizing memories from the previous day. Suggests that during sleep, the brain processes info and stores it more permanently, which may reflect dream content.

Front

Memory Consolidation Theory

Back

Sleep is useful for organizing and consolidating memories or restoring depleted resources used throughout a given day.

Front

Restoration Theory

Back

Sleep is essential for restoring the body's physical and mental resources. It suggests that during sleep, the body repairs tissues, replenishes energy, and strengthens the immune system.