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: Insufficient oxygen during sleep can cause body pain in the mornings. If you're suffering from a condition called sleep apnea, it can impede the oxygen flow to your muscles and organs, thereby causing not only muscle aches but the other potentially. If you think you are caught something from sleep apnea, see your doctor for evaluation and potential management.