in a study,people who had more exposure to sunlight were less likely to complain of sleep disturbances.sunlight entering the pupils of the eyes may reset the body clock by stimulating the pineal gland in the brain to release melatonin and other chemicals at the right times.

there is some evidence that colors affect us physiologically.for example,respiratory movements increase in the presence of red light and decrease in the presence of blue light.similarly, eye blinks increase in frequency when eyes are exposed to red light and decrease when exposed to blue.this seams consistent with our intuitive feelings that blue is more soothing and red more provocative.after changing a schools walls from arange and white to blue,the students blood pressure decreased and their academic performance improved.

the brain is divided into two half ball,they are either indipendent,or cooperative.each of them can work alone,in this way,the brain is likely to do something more effectively,just like our legs do alternatively.so,the pupils can become big and small by the changing lights that go through.as a result,not only do the two half balls work like our legs do,as well as the eye balls move as if they are in dream.

sleep rescue memories.even facts forgotten by people during a busy day may be retrieved if this is followed by a good nights sleep.

researchers from the university of chicago asked vohunteers to remember simple words.many found their memories letting them down towards the end of the day,but the following morning,those who had slept well could recall much more.

researchers,writing in the journal nature,said the brain could rescue lost memories during the night.when the brain is first asked to remember something,that memory is laid down in an unstable state,meaning that it is possible that it could be lost.at some point, the brain consolidates those it deems important into a stable,more permanent state.however, the chicago reserachers suggested that it was possible for a stable memory to be made unstable again. this would mean that memories could be modified then filed away again in the face of new experiences.

tests revealed that the ability to recall the right word tended to tail off as the day ended.however, when the volunteers were retested after a good nights sleep, they were able to recall some words that they had forgotten the previous evening.

sleep also appears to recover or restore memories. if performance is reduced by decay,sleep might actively recover what has been lost,sleep helps some memories mature and also prunes out unimportant memories.

it is clear that everyone needs to sleep,most people rarely think about how and why they sleep,however.we know that if we sleep well,we feelrested.if we do not sleep enough,we often feel tired and irritable.it seems there are two purposes of sleep:physical rest and emotional and psychological rest.we need to rest our bodies and our minds,both are important in order for us to be healthy.each night we alternate between two kinds of sleep:active sleep and passive sleep. the passive sleep gives our body the rest that is needed and prepares us for active sleep,in which dreaming occurs.

throughout the night,people alternate between passive and active sleep.the brain rests, the it becomes active, the dreaming occurs.this cycle is repeated several times throughout the night.during eight hours of sleep. people dream for a total of one and half hours on the average.

the gizmo named regulator of brain is designed to stimulate the right eye at one time  and in next time does the same to the left one(frequency is 45 times at one minute).the pupils are responsed to the changing light and either become biger or smaller,as a result,the eyeballs turn just like they do in our dreams.furthermore,the two half brains can be controled to do work alternatively as good as our legs do when walking.secondly,it is desighned to choose red lights or blue whenever you like.