What is Slow Wave Sleep?

Slow Wave Sleep, also known as Delta sleep, is the sleep stage where your brain is producing its slowest brainwaves, also called Delta waves. While the brain is producing these Delta waves, it is peacefully resting without any thoughts or worries. During this stage of sleep, the body doesn’t move, but it is hard at work to complete some important healing processes. These processes, including growth hormone secretion causing growth and healing, DNA repair, immune system re-balancing, and the removal of harmful material from nerve cells, are strongest in young people, who get the most Slow Wave Sleep, but gradually deteriorate with age. In fact, by their mid to late forties, most people have lost 60-70% of their Delta sleep, and by their seventies it is mostly, if not all, gone. Without this deep level of sleep, your body loses out on some of its most important healing processes.


Public Health Problem

The CDC has declared insufficient sleep a ‘public health problem’, with more than 1/3 American adults not getting enough sleep on a regular basis

6+ Hours of Sleep for Better Health

Sleeping less than 6 hours on a regular basis per night has been shown in studies of more than 1 million subjects over decades to increase obesity, diabetes, heart disease, cancer, and dementia.

Americans Struggle with Sleep

An estimated 164 million Americans struggle with sleep at least once a week.

“Sleep became challenging in my 50s and 60s, and I couldn’t sleep through the night…I relied on coffee to get through the day and fell asleep before the end of the movie. Now, I wake up feeling refreshed and am energized throughout the day.”


Image of woman using Z TRACK for health


The cause of poor sleep, including a reduction in deep sleep, and stress are the same. They both result from reduced parasympathetic activity of the Autonomic Nervous System (ANS), responsible for relaxation during the day and rejuvenating sleep at night, and over-activity of the sympathetic division of the ANS, used for fight or flight. The SOLTEC•SMS safely and non-invasively supports increased activity of parasympathetic division and reduces the activity of the sympathetic division without drugs or side effects.


SOLTEC HEALTH has been investigating and researching sleep since the company formed in 1997. As sleep experts, we are guided by science. To be deemed safe, effective and worthy of further exploration, our technology solutions are continuously subjected to rigorous independent research and testing.


Z•GEN, with guidance from real-time data analyzed by Z•TRACK, provides the stimulus to increase sleep duration and quality. Although this is a tremendous accomplishment, the personal results do not happen overnight. There is typically about a 30-day gradual adaptation period for your sleep to change more substantially.


A Letter from Our CEO

For a more in depth look into our past, present and future, peruse this letter from our CEO, Dr. Dan Cohen.



Z•TRACK doesn’t just track data thoroughly and with precision, it learns from that data and adjusts the activity of Z•GEN for each, individual user, providing customized frequencies associated with sleep. This machine learning is personalized. The more you wear Z•TRACK, the more it learns.

Engineered specifically for sleep, Z•TRACK measures pulse rate variability which it then correlates with built-in motion analysis to provide an accurate picture of your sleep.

Z•TRACK doesn’t just track sleep metrics thoroughly and with precision, it learns from that data and adjusts the activity of Z•GEN to generate frequencies, which are personalized for you.

Z•TRACK truly is like having a sleep lab on your wrist.