![]() REM is the sleep stage most associated with dreaming, although dreaming can also occur in other stages. Other vital signs, such as blood pressure and heart rate, become less regular. During this stage, the eyes move quickly and rapidly from side to side.ĭuring REM sleep, breathing quickens and becomes more erratic. The term “REM” refers to a person’s eye movements. The last stage of the sleep cycle is REM sleep. The overall percentage of deep sleep tends to decrease with age. If a person wakes during deep sleep, they may feel mentally foggy for around 30–60 minutes. This is the stage people typically find most difficult to wake from. With each sleep cycle, the amount of deep sleep decreases. During this stage, heart rate, breathing, and brain waves become regular.Ī person will experience the most deep sleep during the first half of the night. Stage 3 non-REM sleep is the deepest stage of sleep and the hardest to awaken from. Overall, it accounts for more than 50% of sleep in adults. This is a period of deeper non-REM sleep, where the muscles relax further, eye movements stop, and body temperature drops.ĭuring the first sleep cycle of the night, this stage lasts for around 25 minutes, lengthening with each new sleep cycle. This stage is short and lasts for around 1–5 minutes. The muscles also relax, although they may twitch occasionally. ![]() It is a period of light non-REM sleep that slows down a person’s heart rate, breathing, eye movements, and brain waves. Stage one begins when a person shifts from wakefulness to sleep. Below, we list the four stages of the sleep cycle.
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