New pill aims to reset your body clock for better sleep
NCT ID NCT04652882
First seen Dec 09, 2025 · Last updated Jun 19, 2026 · Updated 25 times
Summary
This Phase 3 trial tests whether the drug tasimelteon can help people with Delayed Sleep-Wake Phase Disorder (DSWPD) fall asleep earlier and sleep better. About 70 adults with DSWPD will receive either tasimelteon or a placebo daily. The study measures sleep onset and quality using sleep diaries and activity monitors.
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This is a summary of
the original study
.
Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Study contacts
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Contact
Phone: •••-•••-•••• Email: •••••@•••••
Locations
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Vanda Investigational Site
RECRUITINGLos Angeles, California, 90025, United States
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGRedwood City, California, 94063, United States
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGAurora, Colorado, 80045, United States
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Vanda Investigational Site
RECRUITINGBoston, Massachusetts, 02115, United States
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Vanda Investigational Site
RECRUITINGSt Louis, Missouri, 63123, United States
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGNew Hyde Park, New York, 11042, United States
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGCincinnati, Ohio, 45212, United States
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGCleveland, Ohio, 44195, United States
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGColumbia, South Carolina, 29201, United States
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGSan Antonio, Texas, 78229, United States
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGSherman, Texas, 75092, United States
Contact Phone: •••-•••-••••
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Vanda Investigational Site
ACTIVE_NOT_RECRUITINGInnsbruck, 6020, Austria
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Vanda Investigational Site
RECRUITINGVienna, 1090, Austria
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGBerlin, 10117, Germany
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGHamburg, 20253, Germany
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGMarburg, 35043, Germany
Contact Phone: •••-•••-••••
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Vanda Investigational Site
RECRUITINGSchwerin, 19053, Germany
Contact Phone: •••-•••-••••
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
Tasimelteon (a melatonin-like drug taken as a capsule)
What this could lead to
If it works, this could provide a new treatment option to help people with DSWPD fall asleep earlier and improve their sleep quality.
What could go wrong
This is a small Phase 3 trial with only 70 participants, so results may not apply to everyone. The drug may not work better than placebo, and side effects are possible.
Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.