Sleep deprivation - A condition resulting in inadequate quantity or quality of sleep., Full sleep deprivation - When an individual does not get any sleep at all for a certain period. , Partial sleep deprivation - When an individual does not get enough qualitative or quantitative sleep, but sleeps for some hours. , Affective effects - Emotional impacts of sleep deprivation., Behaviour effects - Observable change in actions influenced by sleep deprivation. , Cognitive effects - Impairments in mental processes due to lack of sleep. , Blood alcohol concentration (BAC) - A measure of the amount of alcohol in the body (bloodstream) expressed as grams of alcohol/100ml of blood., Circadian rhythm sleep disorders - Disruptions in the natural sleep-wake cycle caused by mismatch between a person’s internal biological clock and external environmental cues. Examples include delayed sleep phase syndrome and advanced sleep phase disorder., Delayed sleep phase syndrome - A condition where a person’s sleep-wake cycle is delayed, leading to difficulty falling asleep and waking up at conventional times., Advanced sleep phase disorder - A condition where a person’s sleep-wake cycle is shifted earlier, meaning they sleep or awaken earlier than desired and experience excessive sleepiness., Bright light therapy - A treatment for circadian rhythm disorders and other sleep problems, involving exposure to bright light at specific times of day to help reset the body's internal clock and improve sleep patterns., Zeitgebers - External cues or signals that help regulate the body's internal clock and sleep-wake cycles. They include light, temperature, and social activities., Sleep hygiene - Practices and habits that facilitate good sleep and daytime alertness., Daylight (as a Zeitgeber) - Natural light that helps regulate the circadian rhythm by signalling to the body when it is time to wake up or go to sleep. Exposure to daylight helps maintain a healthy sleep-wake cycle., Blue light (as a Zeitgeber) - A type of light emitted by screens and artificial lighting that can affect the circadian rhythm. Blue light exposure, especially in the evening, can suppress melatonin production and delay sleep onset., Temperature (as a Zeitgeber) - Environmental temperature changes that influence sleep patterns. Cooler temperatures at night can signal to the body that it is time to sleep, while warmer temperatures may disrupt sleep., Eating and drinking patterns (as a Zeitgeber) - Regular meal and drink times that help regulate the sleep-wake cycle. Consistent eating patterns can signal to the body when it is time to sleep or wake up, affecting overall sleep quality.,

Importance of sleep in mental wellbeing: definitions

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