+30 C1-Level Sleep-Related Vocabulary and Expressions

Sleep-related Vocabulary

1. Insomnia: Persistent difficulty falling asleep or staying asleep.
2. Narcolepsy: A neurological disorder characterized by sudden and uncontrollable episodes of deep sleep.
3. Sleep Apnea: A sleep disorder characterized by interruptions in breathing during sleep.
4. Rapid Eye Movement (REM): A phase of sleep associated with vivid dreams and rapid eye movements.
5. Sleep Deprivation: Lack of sufficient sleep, leading to fatigue and various health issues.
6. Nightmare: A vivid, frightening dream that usually occurs during REM sleep.
7. Dream Analysis: The process of examining and interpreting the content of dreams to gain insight into the dreamer's subconscious mind.
8. Sleep Paralysis: A temporary inability to move or speak while falling asleep or waking up.
9. Melatonin: A hormone that regulates the sleep-wake cycle and is often used as a supplement to improve sleep.
10. Sleep Disorders: Medical conditions that affect the quality, timing, and amount of sleep a person gets.
11. Jet Lag: Disruption of the sleep-wake cycle due to rapid travel across multiple time zones.
12. Sleep Aids: Substances, medications, or techniques used to facilitate sleep onset or improve sleep quality.
13. Drowsy Driving: Operating a vehicle while feeling sleepy or fatigued, leading to an increased risk of accidents.
14. Pillow talk: Intimate conversations that occur between partners in bed before sleep.
15. To daydream: To let one's mind wander freely, often into imaginative scenarios unrelated to their immediate surroundings. 

Here are a few sleep-related idioms and expressions

1. Hit the hay: To go to bed or go to sleep.
2. Sleep like a log: To sleep very deeply and soundly.
3. To have a lie-in: To stay in bed longer than usual in the morning.
4. To sleep on a problem: To delay making a decision by waiting until the next day.
5. To be dead to the world: To be in a deep, oblivious sleep.
6. To go out like a light: To fall asleep quickly and deeply.
7. To be tossing and turning: To not be able to sleep.
8. To sleep like a baby: To sleep very well and soundly.
9. To have / take a catnap: A short, light nap; a brief period of sleep.