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2. Doctors Say This Type Of Noise Is Best For Deep Sleep - AOL

   www.aol.com/doctors-type-noise-best-deep...

   “Both brown and pink noise mirror natural sounds—like ocean waves or rustling trees—which can be more calming and easier to sleep with long-term,” says Dr. Dasgupta. Purple noise

3. List of unexplained sounds - Wikipedia

   en.wikipedia.org/wiki/List_of_unexplained_sounds

   Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in duration each.

4. 5 Great Sound Machines That Will Transform Your Sleep - AOL

   www.aol.com/5-great-sound-machines-sleeping...

   In fact, this sound machine offers only the essentials, including a volume knob, a timer, and just six built-in sounds (White Noise, Thunder, Ocean, Rain, Summer Night, and Brook).

5. Music and sleep - Wikipedia

   en.wikipedia.org/wiki/Music_and_sleep

   The decrease in systolic blood pressure, diastolic blood pressure, and heart rate signal a state of calmness, which is essential for having a good night sleep. Sedative music, which is characterized by a slow tempo, repetitive rhythm, gentle contours, and strings, is effective in generating anxiolytic responses to aid sleep.

6. Catathrenia - Wikipedia

   en.wikipedia.org/wiki/Catathrenia

   In addition, sounds can also be long and soft as well as short and loud. [7] Onset time of the noise during the night: The ISCD-2 established latency of noises after falling asleep ranging from 2 to 6 h. [11] However, in some published cases the onset time of the noises is reported as being shorter (3 min [16]). Association with respiratory ...

7. List of nocturnal animals - Wikipedia

   en.wikipedia.org/wiki/List_of_nocturnal_animals

   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.

8. Nocturnality - Wikipedia

   en.wikipedia.org/wiki/Nocturnality

   The kiwi is a family of nocturnal birds endemic to New Zealand.. While it is difficult to say which came first, nocturnality or diurnality, a hypothesis in evolutionary biology, the nocturnal bottleneck theory, postulates that in the Mesozoic, many ancestors of modern-day mammals evolved nocturnal characteristics in order to avoid contact with the numerous diurnal predators. [3]

9. Sleep in animals - Wikipedia

   en.wikipedia.org/wiki/Sleep_in_animals

   Sleep can follow a physiological or behavioral definition. In the physiological sense, sleep is a state characterized by reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone (possibly with some exceptions; see below regarding the sleep of birds and of aquatic mammals), and a compensatory increase following deprivation of the state, this last known ...