However, since 2008 the American Academy of Sleep Medicine refers to both of these as Stage 3 since there wasn’t any clear evidence that there were two distinct stages of deep sleep. This led scientists to conclude that Stage 4 meant that the person had reached a deeper level of sleep. This division was made due to the frequency of delta wave occurrence – Stage 3 consisted of a low amount of delta waves whereas they were more frequent in Stage 4. Deep sleep was considered to consist of two stages – 3 and 4.
They used to be labeled a bit differently in the past when compared to modern usage. Low-frequency delta waves characterize the N3 stage. The first three stages together make up the Non-REM sleep – as opposed to REM sleep – and are consecutively labeled as N1, N2, and N3.ĭeep sleep is also known as slow-wave sleep (SWS) and delta sleep due to the types of brain waves produced during this stage of the sleep cycle. These are – Stage 1 and Stage 2, which fall into the category of light sleep, followed by Stage 3, which falls into the category of deep sleep, and finally REM (rapid eye movement) sleep. Our sleep cycle is typically divided into four stages. This doesn’t mean we have to go through life deep-sleep deprived – we just have to tune into our natural biorhythm and take care of our health by monitoring the amount of sleep we get and by improving our sleep quality. Obtaining deep sleep can be prevented by numerous factors including drug use, alcohol, stress, and sleep-related disorders. Unfortunately, the amount of deep sleep we get declines as we age. Overviewĭeep sleep is immensely important for memory consolidation and tissue regeneration. Although we are aware of some of the physiological and psychological benefits, as well as the negative impact of deep sleep deprivation, there is still a lot we don’t know abou the effects of deep sleep. What are the differences between REM sleep and deep sleep?ĭeep sleep is one of the Non-REM stages of our sleep and is critical to your health and well-being.When does deep sleep occur and how long does it last?.
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