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Everything You Need to Know About 90-Minute Sleep Cycles


Everything You Need to Know About 90-Minute Sleep Cycles

Do you find yourself struggling to get a good night’s sleep? Have you ever heard of the 90-minute sleep cycle? Understanding the science of sleep cycles is essential for our mental and physical health, and optimizing them can improve our overall well-being. 

The 90-minute sleep cycle refers to the natural rhythm of our sleep, during which we pass through various stages of non-rapid eye movement (NREM) and rapid eye movement (REM) sleep. Together, we will explore the four stages of sleep and how we can hack the 90-minute sleep cycle to optimize our sleep quality. 

We will also share tips and techniques for creating a sleep-conducive environment, developing a pre-sleep routine and optimizing our diet and exercise to achieve better sleep and unlock the power of 90-minute sleep cycles. So, let’s dive in and learn how to achieve better sleep cycles for a healthier and happier life.

The Science of Sleep Cycles

Sleep cycles refer to the recurring pattern of stages our brain and body go through during sleep. Understanding these cycles is essential for our mental and physical health and can help us optimize our sleep and improve our overall well-being.

Sleep cycles usually last between 90 to 120 minutes and repeat throughout the night. During a typical night, we go through several cycles, each consisting of all four stages of sleep. Each stage of sleep plays a vital role in our mental and physical health. NREM stages are responsible for physical restoration, while REM sleep is essential for emotional restoration and memory consolidation.

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Understanding the Stages of Sleep 

Good sleep is essential for overall well-being, yet many people struggle to get enough of it. Understanding the stages of sleep can help you optimize your sleep and wake up refreshed and energized. There are four stages of sleep, each with distinct characteristics and functions. They can be divided into non-REM (Rapid Eye Movement) and REM sleep, alternating through the night in set cycles. Let’s dive deeper into each stage and explore how they work together to create a good night’s rest.

  • NREM Stage: Also known as light sleep, this stage is a transition between wakefulness and sleep. Your brain waves begin to slow down, and your muscles relax. You may experience slight twitches or jerks during this stage. If you’re easily awakened at this stage, it’s normal.
  • NREM Stage 2: This stage makes up most of your sleep time, approximately 50%. During this stage, your brain waves continue to slow, and your body temperature and heart rate drop. As a result, you’re not as easily awakened as in Stage 1, but it’s still possible. Your brain begins to organize and process memories, and your body starts to repair itself.
  • NREM Stage 3: Also known as deep sleep, this stage is the most restorative phase of sleep. It is harder to awaken during this stage, and you may feel disoriented if you’re abruptly woken up. This is because your brain produces slow delta waves, and your body repairs and regenerates tissues. Hormones that strengthen your immune system are also released during this stage, crucial for maintaining overall health.
  • REM Sleep: This stage is characterized by rapid eye movements and vivid dreaming. Your brain waves become more active, similar to when you’re awake. Your body becomes temporarily paralyzed to prevent you from acting out your dreams. REM sleep is also important for memory consolidation and emotional regulation.

Hacking the 90-Minute Sleep Cycle 

Experts recommend that the average adult achieves four to six sleep consecutive sleep cycles every day to remain at optimum health. So if you follow our tips below and get your recommended seven hours of sleep each night, you’ll be well on your way to hacking the 90-minute sleep cycle.

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Consistency in Sleep Schedule

Consistency in your sleep schedule plays a vital role in hacking the 90-minute sleep cycle. Adults need seven to nine hours of sleep per night, with consistent timing to maintain a healthy sleep pattern. Following a consistent sleep schedule trains your body to follow a natural circadian rhythm, promoting a smooth transition from light to deep sleep. 

Studies show that individuals who maintain a regular sleep pattern are less prone to sleep disorders, such as insomnia, which can disrupt sleep cycles. Consistency in sleep timing also helps regulate the production of melatonin, the hormone responsible for inducing sleep, ensuring a healthy sleep-wake cycle.

Inconsistency in sleep timing can negatively impact your sleep in many ways. As we’ve learned, the sleep cycle follows a 90- to 120-minute pattern, which includes a series of light, deep and REM sleep stages. Interrupting this pattern can cause you to wake up feeling groggy and tired, which can persist throughout the day, leading to decreased productivity and focus. Inconsistent sleep schedules can also lead to sleep deprivation, which can result in severe health consequences, such as an increased risk of obesity, diabetes and cardiovascular diseases. Creating a consistent sleep schedule is not a one-size-fits-all approach. Instead, consider your lifestyle, personal preferences and daily routines when setting a sleep schedule. 

In the following sections, we’ll show you how consistency can be achieved by setting a regular bedtime and wake-up time, avoiding stimulants such as caffeine and alcohol before bed and creating a sleep-conducive environment. Practicing good sleep hygiene, such as reducing screen time before bed, will also be explained. A consistent sleep schedule can help you achieve more sleep cycles, promoting overall health and well-being.

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Sleep Environment Optimization

Sleep Environment Optimization


The temperature of your sleep environment is an important factor that can affect the quality of your sleep. Unfortunately, people often make the mistake of keeping the temperature too high or too low, which can lead to discomfort and disrupt the sleep cycle. 

An optimal sleep temperature is between 60-67 degrees Fahrenheit, as it promotes deep sleep and helps the body to regulate its temperature naturally. Conversely, sleeping in a room that is too hot or cold can cause night sweats or shivering, leading to sleep interruptions. Solutions to optimize your bedroom temperature include using a smart thermostat or air conditioner to maintain a consistent temperature, using breathable bedding materials and wearing comfortable sleepwear suitable for your locale and climate.


Noise is a significant contributor to sleep disturbances, leading to an irregular sleep cycle. However, people often overlook the impact of noise pollution, which can negatively affect sleep quality, resulting in daytime fatigue and reduced productivity. 

Noisy neighbors, street noise and electronic devices are common sources of noise pollution. Solutions to mitigate noise pollution and create a sleep-conducive environment include using earplugs or closing windows to minimize outside noise. You can also invest in soundproofing curtains made of thick materials — which can do double duty and help block light. Using a white noise machine like the yoga sleep sound machine will also help you drift off to sleep easier.


Light exposure is another big one that impacts the quality of your sleep. Exposure to bright light before bedtime can delay melatonin production, a hormone responsible for inducing sleep, leading to sleep disturbances. People often make the mistake of using electronic devices or watching television before bed, which can expose them to blue light, delaying sleep onset. Others have lighting in their bedrooms and other living spaces that is simply too bright for your body to get the hint that it’s time for sleep.

Solutions to optimize the sleep environment light include using blackout curtains or eye masks to block out light, using low-level nightlights and reducing screen time before bed. You should also opt for soft, ambient lighting in the evening — not just in your bedroom but any living space you’ll use. Creating a dark sleep environment and limiting exposure to bright lights before bed can help promote a healthy sleep cycle, leading to better sleep quality.

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Choosing the Right Mattress

If you want to ensure optimal sleep cycles, having the right mattress to support you is going to be important. There are a few types of mattresses you need to be aware of, each with its advantages and what factors to consider when choosing the perfect one for you.

Innerspring mattresses are the most traditional type of mattress and consist of a coil support system. They offer a firm surface that is excellent if you’re the type who prefers a firmer sleep surface. The advantages of innerspring mattresses include their durability and supportiveness. They are a popular choice for those who have back pain or require additional support while sleeping.

Memory foam mattresses are known for their ability to contour to the shape of the body, offering pressure relief and excellent motion isolation. They are great if you have joint or muscle pain and require pressure relief. They are popular for those who sleep on their side or back.

Latex mattresses are made of natural or synthetic rubber and are known for their hypoallergenic properties and excellent durability. They offer excellent support, pressure relief and temperature regulation. They are an excellent choice for those with allergies or asthma who require a hypoallergenic sleep surface. If this appeals to you, look into a Prana mattress — they use top-quality natural latex combined with state-of-the-art sleep technology to promote a comfortable and healthy sleep surface.

Hybrid mattresses combine the features of memory foam and innerspring mattresses, offering the best of both worlds. The best hybrid mattress will meet all your needs and provide excellent support and pressure relief, motion isolation and temperature regulation. They’re ideal for couples or folks with different sleep positions but enjoy co-sleeping as they cater to various needs. 

Pre-Sleep Routine and Relaxation Techniques

The modern-day lifestyle is often hectic, leaving little time for rest and relaxation. But, as we know, getting a good night’s sleep with multiple sleep cycles is paramount for our physical and mental health. Yet, sometimes, despite our best efforts, we may still struggle to fall asleep. This is where a pre-sleep routine and knowing what to do when you can’t sleep comes in.

A pre-sleep routine is a series of activities that you do before bedtime to help you wind down and prepare for sleep. It’s not just a checklist of things you do before bed like brushing your teeth. An important aspect of a pre-sleep routine is using relaxation techniques. By incorporating relaxation techniques, you can create a peaceful, calming environment and headspace that promotes restful sleep. Here are five techniques and strategies that can help you relax before bedtime:

Pre-Sleep Routine and Relaxation Techniques

  • Progressive muscle relaxation: Tense and relax each muscle group, starting with your toes and working up to your head. This technique helps release tension and promote relaxation.
  • Deep breathing exercises: Focus on taking slow, deep breaths, inhaling through your nose and exhaling through your mouth. This technique helps calm the mind and body, reducing stress and anxiety.
  • Journaling or doing a brain dump: Write down any thoughts or worries that are keeping you up at night. This technique can help declutter the mind and promote relaxation, reducing stress and anxiety that may keep you awake. 
  • Meditation or mindfulness: Focus on the present moment and let go of distracting thoughts. This technique helps calm the mind and promote relaxation. Use guided meditations to help you learn how to do it. 
  • Low-key activities: Engage in a calming activity that helps you unwind and relax, such as reading a book or listening to soft music. This technique can help create a peaceful, calming environment promoting restful sleep. Avoid anything too stimulating, though, because it will have the opposite effect.

Diet and Exercise

Diet and exercise also play an important role in achieving optimal sleep cycles. Proper nutrition and regular physical activity can promote healthy sleep patterns and improve sleep quality.

The food we eat can impact the quality of our sleep. Eating a balanced diet rich in nutrients, such as vitamins and minerals, can promote healthy sleep patterns. Avoiding heavy, spicy or sugary foods close to bedtime will help reduce indigestion and discomfort, negatively affecting sleep quality. It is also recommended to limit caffeine and alcohol consumption, as these can interfere with sleep patterns and make it difficult to fall asleep.

And don’t forget that regular exercise will also improve your sleep quality. Exercise helps reduce stress and anxiety, promoting relaxation and better sleep quality. Regular physical activity can also help regulate the sleep-wake cycle, making it easier to fall asleep and stay asleep. However, it is important to note that exercising close to bedtime can have the opposite effect and may disrupt sleep, so exercising earlier in the day is recommended.

Benefits of Better Sleep Cycles

Getting better sleep helps us optimize our health and well-being. But the perks of better sleep cycles go beyond just feeling well-rested in the morning. Here are some of the key benefits of better sleep:

Benefits of Better Sleep Cycles

  • Improved cognitive function: Better sleep cycles can enhance cognitive function, including memory, concentration and decision-making abilities. Adequate sleep helps the brain consolidate memories and process information, improving cognitive performance.
  • Enhanced emotional well-being: Better sleep can positively impact emotional well-being. Good sleep helps regulate mood and emotions, reducing the risk of mood disorders such as depression and anxiety. It can also improve social interactions and promote a positive outlook.
  • Boosted immune system: Quality sleep is essential for a healthy immune system. During sleep, the body produces cytokines, proteins that help fight infections and inflammation. Lack of sleep can weaken the immune system, increasing the risk of illness and infection.
  • Increased energy levels: Better sleep cycles can increase energy levels and reduce daytime fatigue — no more afternoon slumps! Good sleep promotes physical and mental restoration, helping you feel more energized and alert throughout the day.

Unlock Your Best Sleep

Getting better sleep is essential for our overall health and well-being, and understanding the science of sleep cycles is an important step toward achieving it. By optimizing our sleep environment, creating a pre-sleep routine and adopting healthy lifestyle habits, such as regular exercise and a balanced diet, we can improve our sleep quality and achieve better sleep cycles. 

The benefits of better sleep go beyond just feeling well-rested in the morning; they include improved cognitive function, enhanced emotional well-being, a boosted immune system and increased energy levels. So, let’s prioritize our sleep and optimize our 90-minute sleep cycle to promote a healthier and happier life.

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