![]() ![]() This is a sign that you’re within a deep sleep stage and need it to feel rested. He compares it to Isaac Newton’s Law of Inertia and points out that unless a pressing force is at play to entice someone to wake up, it’s totally normal to wish you were still asleep-or even fall back asleep in the process. “This experience is what’s known as sleep inertia,” he reveals on his website. If someone does wake up during this stage, he says it’s not uncommon to feel especially groggy. Breus, the deep sleep stage is the hardest to awaken from. ![]() Since the N3 stage is the deepest sleep stage, it makes sense that it’s the hardest to snap out of. What happens if you wake up during deep sleep? Then, by the later sleep cycles, you spend less time in the N1, N2, and N3 stages, and more time in REM sleep. According to The Sleep Foundation, you typically get the most deep sleep during the first half of the night. While a full sleep cycle is roughly 90 minutes long and is comprised of all four sleep stages (N1, N2, deep sleep, and REM sleep), the amount of time you spend in each stage changes throughout the night. Together, all of these side effects make one thing very clear: Deep sleep should be your priority-each and every night. When you don’t get enough of it, you’ll become more anxious and could experience deeper depression. And then there’s the emotional impact of sleep deprivation. Breus points out that a lack of deep sleep can lend to a notable physical and cognitive decline, including slower reaction time, lower testosterone, memory issues, riskier decisions, trouble focusing, and more. ![]() “N1 is the lightest sleep, N2 is deeper and plays the most significant role in memory consolidation, and N3 is the deepest of the NREM phase.” “The human body cycles through four to five stages of sleep every 90 minutes overnight,” Dr. The three sleep stages are N1 (light sleep), N2 (medium sleep), and N3 (deep sleep). “The NREM phase is further divided into three stages of sleep,” she explains. According to Sleepless in NOLA sleep consultant Nilong Vyas, MD, medical review expert at Sleep Foundation, the sleep cycle consists of two phases: REM (rapid eye movement) and NREM (non-rapid eye movement). In order to understand deep sleep, you must first acknowledge the phases of the sleep cycle, as well as the stages of sleep. Nilong Vyas, MD, founder of Sleepless in NOLA and a medical review expert for.Michael Breus, PhD, sleep expert and clinical psychologist.Abhinav Singh, MD, FAASM, medical director at the Indiana Sleep Center and a medical review expert for. ![]()
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