In REM sleep, brain wave recordings show similar electrical activity to being awake. "The second part of the cycle is REM sleep. Passing through these four stages of NREM sleep takes about an hour," explains Dr Lee. "Stage four is called deep sleep because it is the hardest part of the sleep cycle to wake anyone up. People who have disrupted sleep often have less deep sleep, because they don't reach the latter stages of NREM so often. Stage four - the deepest level of sleep, where EEG recordings show long frequency, delta waves called slow waves.Stage three - this is moderately deep sleep.Stage one - the initial drowsy period when you first start to fall asleep, which only lasts a few minutes.This is slow-wave sleep, and usually represents between 13% -23% of time spent asleep." "Deep sleep takes place during the latter part – stages three and four - of NREM sleep. That's because, Dr Lee says, there are two stages of sleep: "Non-Rapid Eye Movement (NREM) sleep which accounts for 75% of sleep, and Rapid Eye Movement (REM) sleep which makes up the other 25%," she explains. However, few of us manage to achieve this regularly. The dream situation (excuse the pun) is to be the type of person who falls asleep quickly, and not disturb until the next morning. We must ensure we get the right amount of sleep, but also that our sleep has the right quality." Why do we have broken sleep, and how does it happen? In a lifetime, we spend around one-third of our lives asleep. "Many people do not realise sleep is just as necessary for survival as the need for food and water. "Sleep is not just a trivial pastime, it’s essential for a healthy mind and body," Dr Deborah Lee, GP at Dr Fox Online Pharmacy tells Cosmopolitan. Tossing and turning all night can often leave you feeling worse - so what can you do to ensure that the time you are asleep is regenerating and refreshing as much as possible? ![]() ![]() While getting a solid eight hours might be easier for many of us due to the pandemic, there's no guarantee that more sleep = quality sleep. A spa weekend or great yoga class is all well and good, but the effects of sleeping deeply are unparalleled. There's nothing quite like waking up feeling fresh after a long, deep sleep.
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