Importance of Sleep to Mental Wellbeing

7A: Sleep Deprivation

Defining Sleep Deprivation

• Sleep deprivation refers to inadequate sleep, either in quantity or quality. It can be:
  • Partial sleep deprivation: Having less sleep than what is normally required.
  • Total sleep deprivation: Not having any sleep at all over a 24-hour period or longer.

KEY TAKEAWAY: Sleep deprivation encompasses both insufficient sleep duration and compromised sleep quality, both of which negatively impact psychological functioning.

The Effects of Partial Sleep Deprivation

Partial sleep deprivation can significantly affect a person’s affective, behavioral, and cognitive functioning.

Affective Functioning (Emotional)

• Amplified emotional responses: Increased irritability, heightened sensitivity to stress, and mood swings.
• Reduced emotional regulation: Difficulty controlling emotions, leading to outbursts or inappropriate reactions.
• Lowered mood: Feelings of sadness, depression, or anxiety can be exacerbated.

Behavioral Functioning

• Reduced motor coordination: Slower reaction times, impaired hand-eye coordination, and increased risk of accidents.
• Reduced self-control: Difficulty resisting temptations, such as unhealthy food or risky behaviors.
• Fatigue: Leading to reduced motivation and increased risk of injury.

Cognitive Functioning

• Attention deficits: Difficulty concentrating, easily distracted, and reduced vigilance.
• Impaired memory: Problems with encoding new information, retrieving information from memory, and working memory capacity.
• Reduced decision-making abilities: Difficulty evaluating options, making sound judgments, and planning effectively.
• Illogical or irrational thinking: Difficulty with abstract thought or problem solving.

EXAM TIP: When describing the effects of partial sleep deprivation, be specific about which type of functioning (affective, behavioral, or cognitive) is being affected. Use precise psychological terms.

Affective and Cognitive Effects of One Night of Full Sleep Deprivation Compared to Blood Alcohol Concentration (BAC)

Research has shown that one night of total sleep deprivation can produce similar impairments in cognitive and affective functioning as certain levels of alcohol intoxication.

Cognitive Impairment

Affective Impairment

• Both sleep deprivation and alcohol intoxication can lead to:
  • Increased irritability and mood swings.
  • Reduced emotional control.
  • Increased risk-taking behavior.

COMMON MISTAKE: Students often confuse the specific BAC levels with the cognitive impairments. Remember that 17 hours awake is comparable to 0.05 BAC, while 24 hours awake is comparable to 0.10 BAC.

7B: Circadian Rhythm Sleep Disorders

Defining Circadian Rhythm Sleep Disorders

• Circadian rhythm sleep disorders are disturbances to the sleep-wake cycle caused by a mismatch between a person’s internal biological clock and the external environment.
• The circadian rhythm is approximately 24 hours.

Types of Circadian Rhythm Sleep Disorders

1. Delayed Sleep Phase Syndrome (DSPS):
   • Characterized by a habitual tendency to fall asleep and wake up later than desired.
   • Individuals with DSPS have difficulty falling asleep at a conventional bedtime (e.g., 10-11 PM) and struggle to wake up early in the morning.
   • Often referred to as “night owls.”
2. Advanced Sleep Phase Disorder (ASPD):
   • Characterized by a habitual tendency to fall asleep and wake up earlier than desired.
   • Individuals with ASPD have difficulty staying awake in the evening and tend to wake up very early in the morning.
   • Often referred to as “early birds.”
3. Shift Work:
   • Occurs when a person’s work schedule requires them to be awake and alert during times when their body clock is programmed for sleep.
   • Leads to chronic sleep disruption, fatigue, and increased risk of accidents.

REMEMBER: DSPS = Delayed (sleep later), ASPD = Advanced (sleep earlier), Shift Work = Working outside normal hours.

Treatments of Circadian Rhythm Sleep Disorders Through Bright Light Therapy

• Bright Light Therapy: Involves exposure to intense artificial light to help shift the circadian rhythm.
  • DSPS: Exposure to bright light in the morning can help advance the sleep-wake cycle, making it easier to fall asleep earlier at night.
  • ASPD: Exposure to bright light in the evening can help delay the sleep-wake cycle, making it easier to stay awake later.
  • Shift Work: Strategic exposure to bright light during work shifts and darkness during sleep periods can help minimize the disruption to the circadian rhythm.

APPLICATION: Bright light therapy is a practical application of understanding circadian rhythms, used to treat sleep disorders and improve alertness in shift workers.

7C: Improving Sleep

Improving Sleep Hygiene

• Sleep hygiene refers to practices that promote good sleep quality and duration. Key elements include:

  • Maintaining a regular sleep schedule: Going to bed and waking up at the same time each day, even on weekends.
  • Creating a relaxing sleep environment: Ensuring the bedroom is dark, quiet, and cool.
  • Avoiding stimulants before bed: Limiting caffeine and nicotine intake in the evening.
  • Regular Exercise: But not too close to bedtime.
  • Avoiding heavy meals or alcohol before bed: These can disrupt sleep patterns.
  • Establishing a relaxing bedtime routine: Taking a warm bath, reading a book, or listening to calming music.

Adaptation to Zeitgebers to Improve Sleep-Wake Patterns and Mental Wellbeing

• Zeitgebers are environmental cues that help regulate the body’s internal clock. Adapting to zeitgebers can improve sleep-wake patterns.

Daylight and Blue Light

• Daylight: Exposure to natural daylight, especially in the morning, helps synchronize the circadian rhythm.
• Blue Light: Exposure to blue light from electronic devices (e.g., smartphones, tablets, computers) can suppress melatonin production and interfere with sleep.
  • Recommendation: Avoid using electronic devices for at least an hour before bed, or use blue light filters.

Temperature

• Maintaining a cool bedroom temperature (around 18-20°C) promotes better sleep. The body’s core temperature naturally drops during sleep, so a cool environment facilitates this process.

Eating and Drinking Patterns

• Eating: Avoid heavy meals close to bedtime. Light snacks are okay.
• Drinking: Reduce fluid intake before bed to minimize nighttime awakenings due to the need to urinate. Avoid alcohol and caffeine before bed.

STUDY HINT: Create a table summarizing the different zeitgebers and how to adapt to them for better sleep. This will help you remember the key points.

VCAA FOCUS: VCAA often asks about practical strategies for improving sleep hygiene and adapting to zeitgebers. Be prepared to provide specific examples and explain how they work.