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Lynx Peptides

Human & animal studies

DSIP

DSIP’s early human sleep observations sit alongside conflicting animal findings and an unresolved endogenous signalling role.

Research summary

Acute and delayed effects of DSIP (delta sleep-inducing peptide) on human sleep behavior.

International journal of clinical pharmacology, therapy, and toxicology 1981

Schneider-Helmert D, Gnirss F, Monnier M, Schenker J, Schoenenberger GA

Small human sleep study

More sleep was recorded shortly after DSIP than after placebo in a double-blind crossover experiment involving six healthy volunteers. Subsequent night recordings also showed changes in sleep onset and efficiency without a classic sedation pattern. The very small sample and short observation period make this early human physiology context rather than reliable evidence for treating sleep disorders.

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Increased sleep following intracerebroventricular injection of the delta sleep-inducing peptide in rats.

Neuroscience letters 1983

Ursin R, Larsen M

Rat sleep model

Slow-wave sleep and total sleep increased by about 20% after DSIP in one rat experiment, whereas the vehicle group showed no comparable baseline change. The peptide was delivered directly into the brain. This is a specific experimental response rather than a consistent result across all DSIP sleep models.

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Effects of intracerebroventricular injection of delta sleep-inducing peptide (DSIP) and an analogue on sleep and brain temperature in rats at night.

Pharmacology, biochemistry, and behavior 1985

Obál F Jr, Török A, Alföldi P, Sáry G, Hajós M, Penke B

Rat sleep model

DSIP did not increase sleep when given at the start of the dark period in rats. Wakefulness increased later in the recording, while brain temperature was unchanged. The contrast with earlier sleep-promoting observations makes timing and experimental conditions central to interpreting this literature.

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Models studied

  • Sleep-stage measurements
  • Sleep-onset observations
  • Electroencephalographic research
  • Neuropeptide sleep physiology

Key findings

  • Early human sleep observations

    Six volunteers provide an early sleep-physiology signal, with limited information about reproducibility or longer-term outcomes.

  • Animal slow-wave sleep

    A sleep increase after direct brain delivery in rats contrasts with a separate experiment under different timing conditions.

  • A contrasting null result

    The dark-period rat experiment found no sleep increase, preventing a uniform sleep-promoting interpretation.

References

  1. Acute and delayed effects of DSIP (delta sleep-inducing peptide) on human sleep behavior.

    International journal of clinical pharmacology, therapy, and toxicology 1981

    Schneider-Helmert D, Gnirss F, Monnier M, Schenker J, Schoenenberger GA

    PMID 6895513

    View on PubMed

  2. Synthetic delta-sleep-inducing peptide improves sleep in insomniacs.

    Lancet 1981

    Schneider-Helmert D, Graf M, Schoenenberger GA

    PMID 6112579

    View on PubMed

  3. Increased sleep following intracerebroventricular injection of the delta sleep-inducing peptide in rats.

    Neuroscience letters 1983

    Ursin R, Larsen M

    PMID 6688864

    View on PubMed

  4. Effects of intracerebroventricular injection of delta sleep-inducing peptide (DSIP) and an analogue on sleep and brain temperature in rats at night.

    Pharmacology, biochemistry, and behavior 1985

    Obál F Jr, Török A, Alföldi P, Sáry G, Hajós M, Penke B

    PMID 3841214

    View on PubMed

For laboratory research use only. Content is provided for research reference and is not intended as medical or veterinary guidance.