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Related Experiment Videos

Diazepam and midazolam increase light slow-wave sleep (SWS1) and decrease wakefulness in rats.

M Radulovacki, G Sreckovic, R Zak

    Brain Research
    |June 11, 1984
    PubMed
    Summary
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    Diazepam and midazolam significantly increased sleep in rats, particularly the lighter stages of slow-wave sleep (SWS). These benzodiazepine hypnotics affect rat sleep similarly to how they affect human sleep stage 2.

    Area of Science:

    • Pharmacology
    • Neuroscience
    • Sleep Science

    Background:

    • Benzodiazepines are commonly prescribed for anxiety and insomnia.
    • Their effects on sleep architecture in animal models are crucial for understanding human sleep.
    • Previous research suggests benzodiazepines impact sleep stages, but specific effects on rat sleep require further elucidation.

    Purpose of the Study:

    • To investigate the effects of diazepam and midazolam on sleep patterns in rats.
    • To compare the impact of these benzodiazepines on different sleep stages, particularly slow-wave sleep (SWS).
    • To determine if observed effects in rats correlate with known effects in humans.

    Main Methods:

    • Adult male rats were surgically implanted with electrodes for polygraphic recordings.

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  • Animals received intraperitoneal injections of diazepam (5 mg/kg) or midazolam (10 mg/kg).
  • Sleep was recorded for 6 hours during the dark phase of a 16h light/8h dark cycle.

    • Main Results:

    • Diazepam reduced sleep stage 1 (SWS1) latency by 92% and increased SWS1 and total sleep by 255% and 59%, respectively.
    • Midazolam increased SWS1 by 158% and total sleep by 57% compared to controls.
    • Both drugs significantly altered sleep architecture, with notable increases in lighter sleep stages.

    Conclusions:

    • Benzodiazepine hypnotics, including diazepam and midazolam, increase the lighter stages of slow-wave sleep (SWS) in rats.
    • These findings in rats align with the known effects of benzodiazepines on sleep stage 2 in humans.
    • The study suggests that benzodiazepines selectively promote behaviorally lighter sleep stages in both rats and humans.