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People do not swallow large numbers of spiders during sleep. A sleeping person makes noises that warn spiders of danger. [93] [94] Most people also wake up from sleep when they have a spider on their face. [95] A female Chinese mantis simultaneously copulating with and cannibalizing her mate; this does not occur every time mantises mate.
Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited. During sleep, there is a marked decrease in muscle activity and interactions with the surrounding environment.
The following index is provided as an overview of and topical guide to science: Links to articles and redirects to sections of articles which provide information on each topic are listed with a short description of the topic. When there is more than one article with information on a topic, the most relevant is usually listed, and it may be ...
The information includes sleep onset time, sleep latency, number of awakenings in a night, time in bed, daytime napping, sleep quality assessment, use of hypnotic agents, use of alcohol and cigarettes, and unusual events which may influence a person's sleep. Such a log is usually made for one or two weeks before visiting a somnologist.
They are differentiated between hypnagogic hallucination, that occur at sleep onset, and hypnapompic hallucinations, which occur at the transition of sleep to awakening. [2] Although normal individuals have reported nocturnal hallucinations, they are more frequent in comorbidity with other sleep disorders, e.g. narcolepsy.
One of the important questions in sleep research is clearly defining the sleep state. This problem arises because sleep was traditionally defined as a state of consciousness and not as a physiological state, [14] [15] thus there was no clear definition of what minimum set of events constitute sleep and distinguish it from other states of partial or no consciousness.
Reviews differentiate between having no sleep over a short-term period, such as one night ('sleep deprivation'), and having less than required sleep over a longer period ('sleep restriction'). Sleep deprivation was seen as more impactful in the short term, but sleep restriction had similar effects over a longer period.
A science fair or engineering fair is an event hosted by a school that offers students the opportunity to experience the practices of science and engineering for themselves. In the United States, the Next Generation Science Standards makes experiencing the practices of science and engineering one of the three pillars of science education.