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Related Concept Videos

Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
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CNS Depressants: Barbiturates and Benzodiazepines01:14

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CNS depressants include drugs from the category of barbiturates and benzodiazepines. They are valuable medications for managing anxiety disorders and insomnia. Barbiturates, once used to induce and maintain sleep, have been replaced mainly by benzodiazepines due to barbiturate's toxicity, tolerance, and overdose risks. They interact with GABAA receptors, leading to sedation at low doses and potentially coma and death at higher doses. Phenobarbital, a long-acting barbiturate, possesses...
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Sedatives and Hypnotics Drugs: Miscellaneous Agents01:17

Sedatives and Hypnotics Drugs: Miscellaneous Agents

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Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
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Insufficient Sleep and Sleep Deprivation01:13

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Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...
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Sleepwalking and Sleep Talking01:17

Sleepwalking and Sleep Talking

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Somnambulism, commonly known as sleepwalking, involves individuals engaging in activities ranging from simple walking to more complex behaviors such as driving. Sleepwalking typically occurs during the slow-wave sleep stages 3 and 4 early in the night when the person is not dreaming, contradicting the myth that sleepwalkers are acting out their dreams.
Factors that increase the likelihood of sleepwalking include sleep deprivation and alcohol consumption. Contrary to common beliefs, it is safe...
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Narcolepsy01:07

Narcolepsy

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Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
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Related Experiment Video

Updated: May 3, 2026

Polygraphic Recording Procedure for Measuring Sleep in Mice
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Ocular quinine toxicity in a sleepwalker.

Amit Sinha1, Sahar Al Husainy

  • 1Birmingham Heartlands Hospital, Birmingham, UK.

BMJ Case Reports
|November 30, 2013
PubMed
Summary

A patient experienced severe vision loss and confusion after overdosing on quinine sulfate, a medication for leg cramps. This case highlights the risks of quinine, emphasizing the importance of careful prescription and monitoring.

Area of Science:

  • Ophthalmology
  • Clinical Toxicology

Background:

  • Quinine sulfate is a medication commonly prescribed for nocturnal leg cramps.
  • Long-term use and potential for overdose necessitate awareness of associated toxicities.

Observation:

  • A 55-year-old woman presented with acute visual impairment, headache, dizziness, and confusion.
  • The patient had a history of long-term quinine sulfate use for leg cramps and reported an overdose during sleepwalking.

Findings:

  • Diagnostic assessment confirmed ocular quinine toxicity as the cause of the patient's symptoms.
  • The visual impairment was a direct result of the quinine overdose.

Implications:

  • This case underscores the critical risks associated with quinine prescription, particularly concerning potential overdose.

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  • Healthcare providers should exercise caution when prescribing quinine and educate patients on safe usage and potential adverse effects.