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Melatonin excretion in normal children and in tuberous sclerosis complex with sleep disorder responsive to melatonin

Eleanor Hancock1, Finbar O'Callaghan, Judie English

  • 1Department of Paediatrics, Royal United Hospital Bath NHS Trust, School of Health, University of Bath, Bath, UK.

Journal of Child Neurology
|March 29, 2005
PubMed

Insights

Healthy children show normal melatonin excretion patterns, similar to those with tuberous sclerosis complex who respond to melatonin. This suggests melatonin may act as a simple sedative.

Area of Science:

  • Pediatric Endocrinology
  • Neuroscience
  • Sleep Medicine

Background:

  • Melatonin is a key hormone regulating sleep-wake cycles.
  • Disrupted melatonin secretion is linked to sleep disorders in children.
  • Tuberous Sclerosis Complex (TSC) is associated with sleep disturbances.

Purpose of the Study:

  • To establish normal 6-sulfatoxymelatonin excretion patterns in healthy children.
  • To compare these patterns with TSC patients experiencing sleep disorders responsive to melatonin.
  • To investigate the potential mechanism of exogenous melatonin in improving sleep.

Main Methods:

  • Measured 6-sulfatoxymelatonin excretion in 21 healthy children and 7 TSC patients.
  • Analyzed total excretion, cosinor percentage, and acrophase time of melatonin metabolites.
  • Administered a 5 mg oral dose of melatonin to TSC patients to assess sleep improvement.

Main Results:

  • Healthy children exhibited a mean excretion of 19.0 microg (SD 7.4 microg) with a mean acrophase at 5:54 AM.
  • Circadian rhythm (cosinor percentage) ranged from 52.9% to 100% (mean 87%).
  • TSC patients who responded to melatonin displayed normal melatonin excretion patterns.

Conclusions:

  • Normal melatonin excretion patterns were observed in healthy children and melatonin-responsive TSC patients.
  • Circadian melatonin excretion patterns appear consistent between children and adults.
  • Exogenous melatonin may exert its sleep-promoting effects through simple sedation.

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