Ashwin Lewis
Sleep Cycle is a popular sleep-tracking app for iPhone that aims to help users wake up at the optimal time every morning and improve their overall sleep patterns. The app works by tracking users' movements during the night, relying on the smartphone's accelerometer to monitor movement. The app uses the average human sleep pattern to determine the best window of time to wake up, with the goal of ensuring that users do not wake up during the wrong sleep cycle stage, which can result in grogginess. While some users have found the app helpful in improving their sleep, others have questioned its accuracy and effectiveness, highlighting the challenges of achieving the perfect sleep cycle.
| Characteristics | Values |
|---|---|
| How it works | Tracks your movements during the night to time your morning awakening |
| Tracking method | Uses your smartphone's accelerometer to monitor movement |
| Sleep stages | Four to six sleep cycles per night, each composed of four separate sleep stages |
| Sleep cycle length | On average, 90 minutes each, but can vary from 70 to 120 minutes |
| Sleep cycle composition | Changes throughout the night, with slow-wave sleep dominating the first half and REM being longer in the second half |
| Sleep cycle variation | Influenced by factors such as age, recent sleep patterns, and alcohol consumption |
| Accuracy | May not be the most accurate way to assess sleep, but can help users become more attuned to their circadian rhythms |
| Additional features | Weekly sleep recaps, sleep notes, sleep quality comparisons, and sleep tracking over different periods |
| Cost | Free with an optional premium subscription for $39.99 annually |
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What You'll Learn
Sleep cycle apps
The Sleep Cycle app has four tabs with other functions: Profile (for settings and personal info), Sleep (for sleep tracking and to set an alarm), Journal (where you can analyze your sleep quality and review your sleep quality for various periods), and Statistics (for deeper detail on your sleep data). The Journal tab even offers a comparison to others in your country. Additional features are unlocked with the Premium version, including sleep notes to help you track how different activities, such as drinking coffee or working out, affect your sleep quality. The app is accurate at tracking the consistency of your sleep schedule and is much less expensive than actigraphy.
However, there are some drawbacks to the Sleep Cycle app. For example, if you share a bed with a partner, their movements may trigger the alarm. Additionally, if you accidentally close out of the app, it may not record the amount of time you slept, resulting in incomplete data. Furthermore, research suggests that the stage of sleep a person wakes up from does not actually impact cognitive performance, and sleep cycles are not perfect 90-minute periods.
Despite these considerations, many users have found the Sleep Cycle app helpful in tracking their sleep patterns and waking up at the optimal time, leading to improved sleep and reduced grumpiness in the morning.
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REM sleep
The discovery of REM sleep is credited to Professor Nathaniel Kleitman and his student Eugene Aserinsky in 1953. They linked rapid eye movement to dreams and further research was conducted by scientists including William Dement and Michel Jouvet. REM sleep is considered paradoxical due to its similarities to wakefulness. While the body is paralysed, the brain demonstrates activity comparable to its wakeful state, with cerebral neurons firing with the same intensity. Electroencephalography (EEG) during REM sleep reveals fast, low-amplitude, desynchronized neural oscillation (brainwaves) that resemble the pattern seen during wakefulness.
During a typical night's sleep, you cycle through various stages of sleep, alternating between REM and non-REM sleep. A sleep cycle lasts between 90 and 120 minutes, with three stages of non-REM sleep and a stage of REM sleep. The first period of REM sleep typically occurs after the initial stage of deep sleep and lasts about 10 minutes. As the night progresses, the periods of REM sleep become longer, with the final one lasting up to an hour.
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Sleep quality
The sleep cycle, composed of four stages, plays a crucial role in achieving high-quality sleep. These stages include three non-rapid eye movement (NREM) stages and one rapid eye movement (REM) stage. The first stage, N1, occurs when a person transitions from wakefulness to sleep, typically lasting just a few minutes. The second stage, N2, is characterised by a further slowdown in heart rate and breathing, a drop in body temperature, and relaxed muscles. The third and fourth stages are deep sleep, where the body experiences deeper relaxation, and REM sleep, where the eyes move rapidly, brain waves resemble those during wakefulness, and dreams occur.
The duration of each sleep stage can vary, and a typical night consists of four to six sleep cycles, with each cycle lasting around 90 minutes on average. The first cycle is often the shortest, ranging from 70 to 100 minutes, while later cycles can be longer, falling between 90 and 120 minutes. As the night progresses, the composition of each cycle changes, with the amount of time spent in each stage varying.
Several factors can impact sleep quality. Age, recent sleep patterns, and alcohol consumption can influence sleep architecture, or the breakdown of sleep into cycles and stages. Additionally, stress, caffeine, and certain medications can alter sleep quality and the time spent in each sleep stage. Health conditions, such as narcolepsy and sleep apnea, can also disrupt the usual progression of sleep cycles, affecting sleep quality.
To improve sleep quality, individuals can practice good sleep hygiene. This includes maintaining a consistent sleep schedule, setting a bedtime that allows for sufficient sleep, and establishing a bedtime routine to help the brain associate certain activities with sleep. Addressing lifestyle factors, such as reducing caffeine intake and managing stress, can also positively impact sleep quality.
Understanding sleep cycles and their impact on sleep quality can help individuals make informed adjustments to improve their sleep habits and overall well-being.
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Sleep stages
Sleep is divided into two main phases: rapid-eye movement (REM) sleep and non-rapid eye movement (NREM) sleep. NREM sleep is further divided into three stages, N1 to N3, while REM sleep is one stage. Each phase and stage of sleep includes variations in muscle tone, brain wave patterns, and eye movements.
The first stage of the sleep cycle is N1, which is when a person first falls asleep. This stage usually lasts just one to seven minutes, during which the body and brain activities start to slow, with periods of brief movements. It is easy to wake someone up during this stage, but if they are not disturbed, they can quickly move into the next stage.
The second stage is N2, which is still light sleep, but deeper than N1. During this stage, brain waves slow down and have noticeable pauses between short, powerful bursts of electrical activity. Experts believe that these bursts are the brain organizing memories and information from the time spent awake. Stage 2 NREM sleep accounts for about 45% of total sleep time, and each subsequent N2 stage is usually longer than the last.
The third stage is N3, which is deep sleep. This is the deepest stage of NREM sleep and makes up about 25% of total sleep time in adults. During this stage, brain waves are slow but strong, and the body takes advantage of this very deep sleep stage to repair injuries and reinforce the immune system. The same bursts of brain activity that happen in N2 can also occur in N3, and brain waves specific to this stage help regulate those bursts.
The fourth and final stage is REM sleep. After N3, the body moves back into N2 NREM sleep, which is the gatekeeper of REM sleep. During REM sleep, the body finally enters a state of paralysis as brain activity becomes similar to that of being awake. Dreaming occurs during this stage, and the eyes scurry behind closed eyelids.
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Sleep patterns
The first sleep cycle is usually the shortest, ranging from 70 to 100 minutes, while later cycles tend to be longer, lasting between 90 and 120 minutes. NREM sleep, which makes up the majority of the sleep cycle, consists of three stages. The first stage, N1, occurs when a person first falls asleep and typically lasts one to seven minutes. During this stage, the body and brain activities start to slow down, with periods of brief movements, and it is easy to wake someone up. As the night progresses, an uninterrupted sleeper moves through the subsequent NREM stages, which are more difficult to wake up from.
The REM stage, which is associated with dreaming, tends to be longer in the second half of the night. While the average person experiences four to five REM periods per night, individual sleep cycles and the duration of each stage can vary. Research has shown that sleep cycles are not perfect 90-minute periods and can be up to 20 minutes longer or shorter. Additionally, slow-wave sleep (N3) is compensatory, meaning that missing a night of sleep will result in a longer duration of slow-wave sleep the next night.
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Frequently asked questions
Sleep Cycle is a sleep-tracking app that works by recording your movement during the night to find the best time to wake you up. It aims to wake you up when you are the furthest out of REM sleep in your sleep cycle.
The Sleep Cycle app uses your smartphone's accelerometer to monitor your movement during sleep. It is designed to be placed near you in bed to register movements. When you are in a deeper sleep, the app will document this stillness. When you are restless towards the morning, drifting into lighter stages of sleep, it will alert you to get up for the day.
While the Sleep Cycle app has been reported to work well by many users, it is not a perfect system. The app does not differentiate between your movements and those of a partner, which can trigger the alarm. Additionally, the app does not consider that no two sleep cycles are the same length, and they can vary based on factors like age, recent sleep patterns, and alcohol consumption.
The Sleep Cycle app can help you track your overall sleep patterns and wake up at optimal times, potentially improving your sleep quality. The app provides a weekly overview of your sleep duration and allows you to notice patterns, such as multiple nights of insufficient sleep.
