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Published on: 11/17/2025
What causes delayed sleep phase disorder?
Delayed sleep phase disorder (DSPD) happens when a person's internal clock is out of sync, making them fall asleep and wake up much later than usual. This can be caused by genetics, lifestyle habits, or changes in the body's natural rhythms.
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Explanation
Delayed sleep phase disorder (DSPD) is a condition where a person’s sleep schedule is shifted later than the typical bedtime. This means they fall asleep and wake up much later than most people.
Causes of DSPD:
- Genetic Factors: Some people may have genes that affect their sleep-wake cycle, making them more likely to experience DSPD.
- Lifestyle Habits: Staying up late regularly, using electronics before bed, or having irregular sleep patterns can contribute to DSPD.
- Biological Rhythms: Changes in the body’s internal clock, which controls when we feel sleepy or alert, can lead to DSPD. This clock might be naturally set to a later time for some individuals.
People with DSPD often have trouble waking up in the morning and may feel sleepy during the day. If you or someone you know is struggling with sleep issues, it’s important to talk to a healthcare provider. For mental health support, visit 988lifeline.org.
(References)
- Magee M, Marbas EM, Wright KP Jr, Rajaratnam SM, & Broussard JL. (2016). Diagnosis, Cause, and Treatment Approaches for Delayed .... Sleep medicine clinics, 27542884.
- Wu A. (2023). Updates and confounding factors in delayed sleep-wake .... Sleep and biological rhythms, 37363638.
- Gradisar M, & Crowley SJ. (2013). Delayed sleep phase disorder in youth - PubMed - NIH. Current opinion in psychiatry, 24060912.
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