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Sleep Apnea Sleep Apnea is a serious potentially condition that is far more common than generally understood. Sleep Apnea is a sleeping disorder by brief Interruptions of breathing during sleep. There are two types of sleep apnea; central and obstructive. Central sleep apnea, which is less common, occurs when the brain fails to send the appropriate signals to the breathing muscles to initiate respirations. Obstructive sleep apnea is far more common and occurs when air …

…irregular. Slow wave sleep initially lasts about two hours before the first episode of REM sleep begins. REM sleep is now known to be essential, because walking a person repeatedly at the beginning of each period of REM sleep produces depression, anxiety, out of proportion to the amount of sleep that has been lost. Dreaming is a necessary part of normal sleep. Everyone dreams, even if he or she remember the dreams on awaking up.