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.
Sleep Apnea is an obstruction to your airways when you sleep. As a result, you may stop breathing when you are asleep, which, as stated above, is a frightening thought considering that death can actually result from it. Sleep Apnea is also associated with other diseases, such as hypertension, cardiac failure, obesity, depression, COPD, just to name a few.