DREAM

Hi guys.............I am back with a new and mysterious topic of the history of science and mankind. It’s DREAM? What dream is? why do we get dream? Where the dream originates? Does dreams are messages? Let’s find out the mysterious of dream.

But before going into the land of dream. I wanna you to know about sleep, because its the only place where you can have dream. Actually you can get dream from lot of place like class room, study room, lecture hall, seminar hall............But when you get through the door of sleep you enter the land of sleep. Most people think we need sleep for physical and mental rest. However, we’re physically and mentally quite active during sleep. If the only benefit of sleeping was physical rest, we could practice deep relaxation and not need to sleep. So, why do we spend nearly one third of our lives sleeping? In a sense, we sleep to dream. About three times each night we cycle through distinct stages of sleep. so what are the stages of sleep?

Stage One: Drowsiness. This is when you are still awake but starting to relax and your eyes are closed. If someone were to rouse you from this stage, you would’t think you had any sleep. Stage Two: Light sleep. This is when you have periods of muscle relaxation and spontaneous muscle activity. Your temperature and heart rate decrease in preparation for deep sleep. Stage Three: Deep sleep. Your brain waves slow down. Stage Four: Deep sleep. This is similar to stage three, except more intensified. Non-REM Sleep: This is when your body will go through all four stages of sleep again, a few minutes each stage. REM Sleep: Known as rapid eye movement sleep, your eyes move rapidly from side to side. Your heart rate, brain waves and breathing speed up and your muscles may twitch, although you will be essentially paralyzed. You dream during this stage of sleep and it is because of this that the muscle paralysis occurs. It prevents you from acting out your dreams and injuring yourself in your sleep.

Now see, what dream is? Dreams are a succession of images, ideas, emotions and sensations occurring involuntarily in the mind during certain stages of sleep. The scientific study of dreams is known as oneirology. Dreams have also been described physiologically as a response to neural processes during sleep; psychologically as reflections of the subconscious; and spiritually as messages from gods, the deceased, predictions of the future, or from the Soul.

Started with dream but need to know about REM, Neurology of brain in sleep, Stages of Dream and Is dream colored/Black and white?

Rapid eye movement sleep (REM sleep) is a normal stage of sleep characterized by the rapid movement of the eyes. REM sleep is classified into two categories: tonic and phasic. REM sleep in adult humans typically occupies 20–25% of total sleep, about 90–120 minutes of a night's sleep. During a normal night of sleep, humans usually experience about four or five periods of REM sleep; they are quite short at the beginning of the night and longer toward the end. Many animals and some people tend to wake, or experience a period of very light sleep, for a short time immediately after a bout of REM. The relative amount of REM sleep varies considerably with age. A newborn baby spends more than 80% of total sleep time in REM. During REM, the activity of the brain's neurons is quite similar to that during waking hours; for this reason, the REM-sleep stage may be called paradoxical sleep. Sleep aids the process by which creativity forms associative elements into new combinations that are useful or meet some requirement. This occurs in REM sleep rather than in NREM sleep. Rather than being due to memory processes, this has been attributed to changes during REM sleep in cholinergic and noradrenergic neuromodulation. During REM sleep high levels of acetylcholine in the hippocampus suppress feedback from hippocampus to the neocortex, and lower levels of acetylcholine and norepinephrine in the neocortex encourage the spread of associational activity within neocortical areas without control from the hippocampus. This is in contrast to waking consciousness, where higher levels of norepinephrine and acetylcholine inhibit recurrent connections in the neocortex. REM sleep through this process adds creativity by allowing "neocortical structures to reorganize associative hierarchies, in which information from the hippocampus would be reinterpreted in relation to previous semantic representations or nodes. Physiologically, certain neurons in the brain stem, known as REM sleep-on cells, (located in the pontine tegmentum), are particularly active during REM sleep, and are probably responsible for its occurrence. The release of certain neurotransmitters, the monoamines (norepinephrine, serotonin and histamine), is completely shut down during REM. This causes REM atonia, a state in which the motor neurons are not stimulated and thus the body's muscles do not move. Lack of such REM atonia causes REM behavior disorder; sufferers act out the movements occurring in their dreams.

watch out for the future post to know the details of dream and how to interpret you dream.