Delayed Sleep Phase Syndrome (DSPS)

What is it?

Delayed Sleep Phase Syndrome (DSPS) is a circadian rhythm disorder where a person's internal "body clock" is delayed by two hours or more relative to a conventional sleep-wake cycle. This means they naturally feel sleepy very late at night (e.g., 2 or 3 AM) and have extreme difficulty waking up in the morning for school or work. It's not a matter of choice or bad habits; their internal timing is simply shifted later.

Common Symptoms:

• A persistent inability to fall asleep until very late (e.g., after 2:00 AM).
• Extreme difficulty waking up at a conventional time (e.g., 7:00 AM), feeling groggy and disoriented.
• When allowed to follow their own schedule (on weekends or holidays), sleep quality and duration are normal and refreshing.
• Chronic daytime sleepiness and fatigue occur when forced to adhere to a conventional 9-to-5 schedule.

Potential Solutions:

Treatment focuses on gradually shifting the body clock earlier. This is done with a combination of behavioral therapies. The most common is using bright light therapy in the morning (using a specialised light box for about 30 minutes shortly after waking) to signal "daytime" to the brain. Conversely, it's crucial to avoid bright light, especially from screens, in the two to three hours before desired bedtime. In some cases, a carefully timed, low dose of melatonin in the evening (several hours before sleep, not at bedtime) can help advance the sleep phase, but this should be done under medical guidance.

When to see a specialist?:

If the delayed schedule significantly interferes with your ability to perform at work, school, or meet social responsibilities, and self-help strategies are not effective, a sleep specialist can provide a structured treatment plan (like chronotherapy) and properly guide the use of light therapy and melatonin.