Positives

• Time-release formulations more closely mimic the natural overnight cortisol-melatonin curve, supporting sleep-maintenance (vs sleep-onset) issues common in ME/CFS and Long COVID where patients fall asleep but wake repeatedly RTHM.
  
  
• ME/CFS patients with delayed sleep-wake phase disorder who time their synthetic melatonin to their individual dim-light melatonin onset (DLMO) commonly describe meaningful improvements in their fatigue severity and cognitive function PMC.
  
  

Negatives

• One patient said time-release melatonin left them with an awful groggy, hungover, drunk feeling that took hours to wear off the next morning, calling it almost worse than the insomnia they were treating Phoenix Rising.
• Drugs.com Time Release reviews average only 6.4/10 across the board, and one reviewer reported nightmares, fragmented sleep, and a sore throat from the time-release version, switching back to plain OTC melatonin Drugs.com.

Hurdles & Side Effects

• Patients on doses above 5 mg report no extra benefit but more headaches, next-day dizziness, and vivid dreams, and many say they cannot drive within 4 hours of taking time-release because next-day drowsiness lingers Drugs.com.
• Patients repeatedly note Circadin and other slow-release brands behave very differently from immediate-release pills, and those with POTS warn each other to avoid melatonin altogether because it often worsens their orthostatic symptoms Phoenix Rising.