Circadian rhythm sleep disorder, delayed sleep phase type

MONDO:0024377

A circadian sleep disorder in which the individual's internal body clock is delayed with respect to the external day/night cycle.

Also known as: DSPS, delayed sleep phase syndrome, sleep wake schedule disorder, delayed phase type, sleep-wake schedule disorder, delayed phase, sleepwake schedule disorder, delayed phase

40 clinical trials for this condition and its sub-types, 12 tagged with Circadian rhythm sleep disorder, delayed sleep phase type itself.

Follow this condition to get notified about new trials

Where it sits in the disease tree

Browse by category →

Part of

↑ Circadian rhythm sleep disorder (138)

Including sub-types (40) Tagged with Circadian rhythm sleep disorder, delayed sleep phase type (12)

Trials to join now! 8 Not yet finished but already full! 1 Completed 3

Could a new pill fix your body clock? phase 3 trial underway

Symptom relief Ongoing

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. 70 adults with DSWPD will receive either tasimelteon or a placebo daily. The study measures sleep onset and quality using sle…

Phase 3 • Sponsor: Vanda Pharmaceuticals • Aim: Symptom relief

Last updated Jul 29, 2026 00:00 UTC

Circadian rhythm sleep disorder, delayed sleep phase type

Where it sits in the disease tree

Could a new pill fix your body clock? phase 3 trial underway