The Sleep Cycle
This is the daily, 24 hour biological cycle of sleep and wakefulness
What is the circadian rhythm?
During prolonged wakefulness, this chemical builds up in the brain to create "sleep pressure," but its effects are temporarily blocked when you consume caffeine.
What is adenosine?
This evolutionary theory suggests that sleep developed as a survival mechanism to keep organisms quiet and safe from predators during dangerous times of day.
What is the adaptive (evolutionary) theory?
This is one of the most common parasomnias which involves walking and preforming basic functions like moving objects well being asleep.
What is Sleepwalking/Somnambulism?
This type of brain wave is present when the body begins to relax and prepare for sleep
What is alpha waves?
Adequate deep sleep triggers a major release of this hormone, which is essential for cellular repair, tissue growth, and muscle recovery.
What is human growth hormone (HGH)?
In Freudian dream analysis, these two terms describe the difference between the literal, remembered storyline of a dream and its hidden, psychological meaning.
What are manifest and latent content?
Episodes of intense panic, screaming, or flailing, most common in children, where the person remains asleep and unremembered in the morning.
What is Sleep Terrors (nightmares)?
This complete human sleep cycle lasts for approximately this many minutes.
What is 90 minutes?
Sleep deprivation disrupts these two hunger regulating hormones, causing an increase in appetite and cravings for high calorie foods.
What are ghrelin and leptin?
This biological theory states that dreams are simply the cerebral cortex's attempt to make sense of random neural signals coming from the brainstem during REM sleep.
What is the activation-synthesis hypothesis?
A temporary inability to move or speak when falling asleep or waking up, often accompanied by frightening hallucinations.
What is Sleep Paralysis?
Stages 1 through 4 of sleep are collectively known by this name.
What is NREM (Non-REM) sleep?
Discovered relatively recently, this waste clearance system activates during deep sleep to flush metabolic waste and toxins like beta amyloid out of the brain
What is the glymphatic system?
This cognitive framework proposes that sleep is essential because it allows the brain to sort, restore, and consolidate the day's experiences into long-term memory.
What is the information-processing (or memory consolidation) theory?
This condition causes a person to hear loud auditory hallucinations as they are about to fall asleep.
What is Exploding Head Syndrome?