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Hypnagogia. Hypnagogia is the transitional state from wakefulness to sleep, also defined as the waning state of consciousness during the onset of sleep. Its opposite state is described as hypnopompia – the transitional state from sleep into wakefulness. Mental phenomena that may occur during this "threshold consciousness" phase include ...
Cannabis, similarly, has sleep-inducing benefits in the early part of the night, but sleep-disturbing effects later. Get some variety in your day: One of the reasons babies sleep so much is ...
Entoptic phenomena (from Ancient Greek ἐντός (entós) 'within' and ὀπτικός (optikós) 'visual') are visual effects whose source is within the human eye itself. (Occasionally, these are called entopic phenomena, which is probably a typographical mistake.) In Helmholtz 's words: "Under suitable conditions light falling on the eye ...
Cone cells or cones are photoreceptor cells in the retinas of vertebrates' eyes. They respond differently to light of different wavelengths, and the combination of their responses is responsible for color vision. Cones function best in relatively bright light, called the photopic region, as opposed to rod cells, which work better in dim light ...
A new review finds that the popular lenses don't help with eye strain, alertness or sleep. ... the light that hits the eye into the images people see. But whether blue light exposure actually ...
Summary. Laser eye surgery is a type of surgery done to reshape the cornea and improve vision. An eye surgeon will conduct a series of tests before surgery to ensure your eyes are healthy before ...
Microsleep. A microsleep is a sudden temporary episode of sleep or drowsiness which may last for a few seconds where an individual fails to respond to some arbitrary sensory input and becomes unconscious. [1][2] Episodes of microsleep occur when an individual loses and regains awareness after a brief lapse in consciousness, often without ...
Night vision is the ability to see in low-light conditions, either naturally with scotopic vision or through a night-vision device. Night vision requires both sufficient spectral range and sufficient intensity range. Humans have poor night vision compared to many animals such as cats, dogs, foxes and rabbits, in part because the human eye lacks ...