In contrast, Manser says, a person's passive vocabulary consists of the words whose meanings they knowâso that they do not have to look the words up in a dictionaryâbut which they would not necessarily use in ordinary conversation or writing (The Penguin Writer's Manual, 2004).
Sleep Apnea, Night Terrors, and Nightmares. Sleep apnea may also be to blame for your nightmares. During sleep apnea, your brain senses the low oxygen and realizes that you are under a very real threatâyou are being choked or smothered by your own bodyâand if nothing is done you will die.
My oxygen saturation is always around 94% and falls to 80s% sometimes during sleep. My heart rate at many times during rest time will fall to 50s bpm and will feel short of breath and during sleep will go below 50 bpm causing me to wake up with adrenaline surges! Thanks. adrenaline.