I know the Internet is full of lists with citiesâ nicknames, but I decided to make my own, composed of the worldâs most important cities, and I hope this will be useful for my readers. 1. Paris â The City of Love, The City of Light, La Ville-Lumiere. 2. Prague â The City of Hundred Spires, The Golden City, The Mother of Cities.
Sleep debt or sleep deficit is the cumulative effect of not getting enough sleep. A large sleep debt may lead to mental or physical fatigue. There are two kinds of sleep debt: the results of partial sleep deprivation and total sleep deprivation. Partial sleep deprivation occurs when a person or a lab animal sleeps too little for several days or weeks. Total sleep deprivation means being kept awake for at least 24 hours. There is debate in the scientific community over the specifics of sleep debt
Normal sleep contains periods of REM (rapid eye movement-dream sleep) during which the brain stem inhibits, or turns off, the motor neurons in our spinal column, preventing any movement except for the eyes. Normally, this only occurs during dream sleep. The apparent reason for sleep paralysis is our safety.