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Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night. Cathemeral, a classification of organisms with sporadic and random intervals of activity during the day or night. Matutinal, a classification of organisms that are only or primarily active in the pre-dawn hours or early night.
The sleep cycle of alternate NREM and REM sleep takes an average of 90 minutes, occurring 4–6 times in a good night's sleep. [ 17 ] [ 22 ] The American Academy of Sleep Medicine (AASM) divides NREM into three stages: N1, N2, and N3, the last of which is also called delta sleep or slow-wave sleep . [ 23 ]
“A good sleep environment that is very dark, quiet, cool, and comfortable can improve sleep,” advises the CDC. It can also ward off stress. It can also ward off stress.
Night photography (also called nighttime photography) is the capturing of images outdoors between dusk and dawn. Night photographers generally have a choice between using artificial lighting and using a long exposure , exposing the shot for seconds, minutes, or hours in order to capture enough light to record an image.
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American tourists Ted Barnett (C) and Jamie Otten look at news photos of the attacks on the World Trade Centre buildings in a cybercafe in Calcutta, September 12, 2001. ... Good Morning America.
Calmness is a quality that can be cultivated and increased with practice, [7] [better source needed] or developed through psychotherapy. [8] It usually requires training for one's mind to stay calm in the face of a great deal of different stimulation, and possible distractions, especially emotional ones.