Sleep and dreaming Flashcards
Define sleep cycle.
A nightly pattern of deep sleep, like sleep and dreaming
What is REM sleep?
Rapid eye movement, caused by eyes, moving a lot behind the eyelids, often while dreaming
What is NREM sleep?
Non-rapid eye movement sleep (make up the four stages of sleep)
What are the four NREM stages of sleep?
- Sleep onset
- Late night stage
- Pre-deep sleep
- Deep sleep
Define ‘sleep onset’.
-Period between wakefulness and sleep
- Light sleep-can be woken easily
- Muscles less active
- Alpha waves (resting waves)
Define ‘late night stage’.
- Eye movement stops
- Body temp starts to drop
- Heart rate slows
- Mainly theta brain waves and spindles (helps us rest)
Define ‘pre-deep sleep’.
- Slow delta waves
- Hard to be woken up
Define ‘deep sleep’
- Slow delta waves
- Hard to be woken up (if you get woken, you feel disorientated)
- No eye movement
- Sleep walking/night terrors in this stage
What stage does sleep walking/night terrors occur?
Deep sleep
What is sensory blockade?
Sight, sound, touch, taste and smell is blocked
What is movement inhibition?
Happens in REM sleep. Movement is prevented. Also known as sleep paralysis.
What is the average amount of sleep needed for adults and children/ teenagers?
Adults - 7 hours
Children/teenagers - 9 hours
What is the main function of sleep?
Survival
What is sleep deprivation?
Not having enough sleep. This can affect physical functioning such as weight and brain functioning.
What are the effects of sleep deprivation?
- Cognition (thinking)
- Day-to-day activities like work or driving
- weak immune system
Define ‘circadian rhythm’.
Human body rhythms that have a daily (24 hour) cycle such as the sleep/wake cycle
What is a bodily rhythm?
A biological (internal) rhythm that can happen daily, monthly or annually
What is the sleep/wake cycle?
A daily cycle of biological activity based on a 24 hour period (circadian rhythms) that is influenced by day and night
De if ‘ultradian rhythm’.
A biological rhythm, which is shorter than a day - such as stages of sleep
Define ‘hormones’.
Sleep helps to reset hormones and what we do in our day affects our hormone levels
What are the internal influences on sleep?
- hormones
What are the names of the hormones which affect sleep?
- Adrenocorticotropic (ACTH) hormone
- Melatonin hormone
What is melatonin?
A hormone that signals the need for sleep
What triggers melatonin?
Darkness