Inclusion Criteria:
* Aged 18 to 60 years of any gender, with a history of staying up late or mild sleep disorder, and Pittsburgh Sleep Quality Index (PSQI) score between 7 and 15 points (mild to moderate sleep impairment).
* Regular daily schedule with bedtime from 22:00 to 24:30 and wake-up time from 6:30 to 8:30; long-term daily schedule fluctuation ≤ 2 hours, and able to maintain a fixed schedule throughout the trial.
* No abnormal saliva secretion and capable of completing saliva sample collection independently and normally.
* Body Mass Index (BMI) ranging from 18.5 to 28.0, without extreme emaciation or obesity.
* Able to participate in pre-trial centralized training and operational assessments (including wearable bracelet wearing, saliva collection, and questionnaire filling), and pass the assessment before enrollment.
* No intake of sleep aids, anti-anxiety drugs, antidepressants, central nervous system regulators, sleep-improving health foods and related products within 2 weeks prior to enrollment.
* Free from severe organic diseases, including cardiovascular and cerebrovascular diseases, liver and kidney dysfunction, psychiatric disorders, and nervous system diseases.
* Free from severe sleep disorder subtypes, such as obstructive sleep apnea syndrome.
* No history of allergy to the ingredients and excipients of the test product, and voluntarily sign the informed consent form.
Exclusion Criteria:
* Aged under 18 years or over 60 years.
* Current smokers, or subjects with alcohol drinking habits of ≥3 times per week who have not quit alcohol within one month before the trial.
* Long-term intake of stimulating beverages, defined as drinking strong tea, coffee or energy drinks ≥3 cups per day.
* Experienced drastic changes in diet or daily routine within one month before enrollment, such as frequent business trips, travel, shift work, or dramatic dietary habit changes.
* Diagnosed with severe sleep disorders or obstructive sleep apnea syndrome.
* Participated in other human clinical trials, received professional sleep intervention therapy, or consumed products containing N-acetylneuraminic acid within one month before enrollment.
* Pregnant or lactating females, or those planning to become pregnant within one year.
* Long-term shift workers, regular severe night owls, or subjects with extremely unstable sleeping environments.
* Intolerant to wearing smart wearable bracelets or unable to cooperate with trial-related examinations and sample collection.
* Staff of the trial institution and other personnel involved in this project.
* Scheduled to receive surgical treatment during the trial period.
* With a history of severe food or drug allergies.
* Diagnosed with digestive system organic lesions such as gastrointestinal ulcers and bleeding.
* Suffering from severe physical and mental illnesses under treatment, severe cardiovascular, cerebrovascular and hematological diseases, severe liver and kidney dysfunction, pulmonary infection or malignant tumors.
