Definition

Noun: - A recurring sleep state characterized by the absence of rapid eye movements and dreaming. This stage constitutes the majority of normal sleep time and is associated with synchronized brain activity, slower breathing and heart rate, and bodily restoration.

Usage

• Orthodox sleep is the scientific term for the non-dreaming phases of sleep, which include stages 1 through 4, ranging from light to deep sleep.
• It is contrasted with REM sleep (Rapid Eye Movement sleep), which is the period associated with vivid dreaming.

Examples

• Most of the body's physical repair occurs during orthodox sleep.
• The sleep cycle alternates between periods of orthodox sleep and REM sleep throughout the night.
• A lack of deep orthodox sleep can lead to feelings of unrefreshed fatigue upon waking.

Advanced Usage

• Slow-wave sleep (SWS): This is a specific, deep phase within orthodox sleep (stages 3 and 4) characterized by delta brain waves. It is often used synonymously with deep orthodox sleep.
  • The most restorative phase of orthodox sleep is slow-wave sleep.

Variants and Related Words

• NREM sleep (Non-Rapid Eye Movement sleep): This is a direct synonym for orthodox sleep. The two terms are used interchangeably in sleep science.
• REM sleep: The contrasting sleep state characterized by rapid eye movements, brain activity similar to wakefulness, and dreaming.

Synonyms

• NREM sleep
• Non-REM sleep
• Synchronized sleep

Notes on Meaning

This term is primarily used in technical, medical, and scientific contexts related to sleep research and neurology. It is not commonly used in everyday conversation, where people would typically refer to "deep sleep" or "light sleep" instead.

Noun

1. a recurring sleep state during which rapid eye movements do not occur and dreaming does not occur; accounts for about 75% of normal sleep time