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( Sleep) Sleep is a natural state of bodily rest observed throughout the animal kingdom. It is common to all mammals and birds, and is also seen in many reptiles, amphibians and fish. In humans, other mammals, and a substantial majority of other animals which have been studied — such as fish, birds, ants, and fruit-flies — regular sleep is essential for survival.^[1] However, its purposes are only partly clear and are the subject of intense research.^[2]

In mammals and birds the measurement of eye movement during sleep is used to divide sleep into the two broad types of Rapid Eye Movement (REM) and Non-Rapid Eye Movement (NREM) or "Non-REM" sleep. Each type has a distinct set of associated physiological, neurological and psychological features.

Sleep proceeds in cycles of REM and the four stages of NREM, the order normally being

In humans this cycle is on average 90 to 110 minutes,^[3] with a greater amount of stages 3 and 4 early in the night and more REM later in the night. Each phase may have a distinct physiological function. Drugs such as sleeping pills and alcoholic beverages can suppress certain stages of sleep (see Sleep deprivation). This can result in a sleep that exhibits loss of consciousness but does not fulfill its physiological functions.

Sleep Subcategories Sleep Articles Do Natural Sleep Remedies Really Work? by Philip Tsang If you ever have trouble sleeping and mention that you're considering taking sleeping pills, someone invariably asks if you've considered natural sleep remedies. Your friends are probably just concerned about your health and welfare, and they want t... Smart Tips On How To Fall Asleep by Philip Tsang Before giving up and going to the pharmacy for sleeping pills, you should know that there are alternatives that will probably work better. Quite a few of us have trouble sleeping occasionally; for some of us it's a chronic problem. But prescription... Tips and Advice on How To Sleep Better by Philip Tsang Are you having trouble sleeping at night? If the research studies are correct, quite a few people have trouble falling asleep and staying asleep. Lack of sleep at night can lead to symptoms of sleep deprivation during the day. Not only do you feel ... For Insomnia, The Cure Depends On The Cause by Philip Tsang We live in a world that judges you on your performance and expertise. So if you are struggling with insomnia and dragging through life day after day, you may find it difficult to get ahead. No one can decide for you when you've had enough of the slee... The Benefits of Melatonin to Promote Sleep by Fabiola Castillo Melatonin is also called the “hormone of darkness.” This is because production of this particular hormone is only permitted at night. It is present in human beings, animals and in some other living organisms like algae. It has been seen that these ho... Sleep Hypnosis by Tim Bartley   However… there is one type of hypnosis where you can actually be manipulated (you cannot be manipulated in office visits…) This isn't regular hypnosis as you would undergo in someone's office or in a stage act. This ... Hypnosis Audio CD Program by crizza reyes There are so many people offering a hypnosis CD or hypnosis audio programs. Some are more well known but be sure how they are well known. Is it self promotion and advertising so they look like they are "the best" or have they been endorsed by reputab... Binaural Beats - Brain Wave Entrainment by Jess Ba-ad You must have heard of binaural beat frequencies. Neurophysiologists have used this for cognitive and neurological research. Ordinary people can also benefit from this discovery by Heinrich Wilhelm Dove way back 1839 as you’ll see in a little while. ... Weight Loss and Sleep - Their Interconnected Relationship by Benny Robinson It is observed that even when you are following a rigorous weight loss program or you are dieting, poor pattern of sleep or lack of sleep may defeat you. Scientific studies show that one of the reasons for weight gain can be lack of sleep. Experts ar... Stressed Out? by Melissa Allen Small amounts of stress can be beneficial and healthy for us—it aids in bringing out things like ambition, motivation, and persistence. It can drive us. But when the delicate balance between healthy stress levels and dangerous stress levels favors th...