We also need to remember that sleep deprivation may be caused by more serious problems, such as obstructive sleep apnea (OSA) - we can screen for it with tools like Epworth sleepiness scale, AHI or STOP-BANG. Who isn't guilty of going to sleep too late because of ‘binge-scrolling’ FB or Twitter? Its not just a social media addiction that means we sleep late we often eat late, drink alcohol or just stare at the TV without realizing it all leads to sleep deprivation that can cause, amongst other things, insomnia, premature skin aging, decreased sex drive, and concentration problems. Your brain imitates waves just as if you were awake, with your eyes moving rapidly but still closed. REM sleep stage (R) is where dreams happen. Also, during this stage, your body and muscles are being restored by growth hormones. That's why if you nap for too long during the day (entering deep sleep) you don't feel as sleepy that night. It's also the most important sleep stage as it refreshes you the most and reduces your need for sleep. It's very hard to wake someone during this stage. Your body is preparing, slowly, for deep sleep, with your brain waves becoming slower.ĭeep sleep stages (N3, previously divided into N3 and N4) are also known as delta sleep or slow wave sleep. Light sleep stages (N1, N2) are characterized by muscle contractions and being woke easily.
People's brains usually don't go from stages 1 to 5, but rather: stages of light sleep, stages of deep sleep, REM, and then back to stages of light sleep and stages of deep sleep. Early in the night, stages of deep sleep are longer than REM sleep, but this swaps round as the night progresses. The duration of each stage oscillates between 5 and 15 minutes.
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