Learn More About Sleep

Sleep Score

The sleep score is a comprehensive assessment of your sleep quality, presented as a percentage. The higher the percentage, the better the sleep quality. By continuously monitoring your sleep score, you can adjust your routine, improve the quality of your rest, maintain a good mood, and feel more energized!

Factors Affecting Sleep Score

PeakWatch calculates your sleep score by analyzing various factors such as sleep duration, sleep stages, sleep heart rate, and sleep patterns.

  • Sleep Duration: Influenced by genetics, biological clock, age, and other factors, the required sleep duration varies from person to person. The National Sleep Foundation recommends that adults sleep 7-9 hours per day. Considering individual differences, 6-10 hours is considered a reasonable range.
  • Sleep Stages: Sleep is typically divided into Rapid Eye Movement (REM) and Non-Rapid Eye Movement (NREM) sleep. NREM sleep is further divided into light sleep and deep sleep. The most important stages are deep sleep and REM sleep, known as restorative sleep, which helps the body and brain recover.

Sleep Debt

Sleep debt refers to the accumulated deficiency or poor quality of sleep over a period of time. If not compensated for, sleep debt can negatively affect physical and cognitive functions, causing daytime fatigue, difficulty concentrating, and even impacting memory and emotional stability.

Everyone's required sleep duration is different. PeakWatch uses long-term monitoring to analyze your sleep quality and determine your optimal sleep duration, thus calculating your sleep debt.

To improve sleep quality and eliminate sleep debt, try to maintain regular sleep hours, create a comfortable sleep environment, and avoid excessive mental activity before bedtime.

Sleep Stages

Based on brain electrical activity, eye movements, and muscle tension changes, sleep is typically divided into the wake stage, REM sleep, and NREM sleep. NREM sleep is further divided into light sleep and deep sleep.

  • Wake Stage: During sleep, you may occasionally wake up due to internal or external influences. Sometimes these awakenings are so brief that they go unnoticed. Normal wake times are usually less than twice per night, accounting for less than 5% of total sleep time.
  • Light Sleep Stage: Transitioning from wakefulness to sleep, the first stage is light sleep. Heart rate and breathing slow down, muscles relax, eye movements stop, body temperature drops, and brain wave activity slows, making it easy to wake up. Light sleep typically accounts for 20%-60% of total sleep time.
  • Deep Sleep Stage: During deep sleep, heart rate and breathing reach their lowest levels, there are no eye or muscle movements, and waking up is difficult. If awakened, one may feel groggy. Experts believe this stage is crucial for physical recovery, growth, and immune system enhancement, typically accounting for 20%-40% of total sleep time.
  • REM Stage: In this stage, muscle tone disappears, physiological indicators become active and unstable, muscles involved in daily activities are paralyzed, heart rate and breathing increase, and body temperature regulation stops. Waking up is difficult, and REM sleep usually accounts for 10%-30% of total sleep time.