An Exploratory Real-world Study to Explore the Effects of Fortified Powdered Beverage on Sleep Quality in Chinese Adults with Mild Sleep Issue(s) or Complaint(s)

Inclusion Criteria: 1. Adults older than 50 years of age; 2. Chinese ethnicity; 3. BMI is between 18 and 30 (excluding upper and lower bound values); 4. Mild sleep issue(s) and/or complaint(s), including but not limited to difficulty initiating sleep, difficulty maintaining sleep, increased number of nocturnal awakenings, early awakening, complaints of non-restorative sleep, dissatisfaction with sleep quality etc.; 5. PSQI score \>7 at screening; 6. PHQ-4 score ≤ 3 at screening; 7. Sufficient ability in Chinese to complete informed consent and other study documents, and willingness to complete this study according to the study protocol; 8. Sufficient ability to install and use a secure WeChat platform on the mobile phone during the study period; stable connectivity to network through mobile phone; 9. Sufficient reading and writing and understanding ability in Chinese to complete questionnaires; daily diaries etc.; 10. Can be directly contacted by mobile phone or WeChat throughout the study; 11. Stable life status with no cross-provincial moving or job changing in the past 6 months, no intention to move or change job during study period. Exclusion Criteria: 1. Currently receiving medication and other therapies for sleep disorders, including but not limited to sleeping pills and traditional Chinese medicine or therapies; 2. Predominant complaint(s) of parasomnia or sleep apnea and/or medically diagnosed primary sleep disorders including but not limited to obstructive sleep apnea (OSA), narcolepsy, periodic limb movement (PLMD), restless leg syndrome (RLS), or REM sleep behaviors disorder; 3. Long-term (≥3 months) use of drugs that induce sleep disturbances, including but not limited to CNS stimulants, anti-depressents, antipsychotics etc.; 4. Use sedative drugs within 4 weeks prior to screening; 5. Use of dietary supplements with sleep effects within 4 weeks prior to screening including but not limited to melatonin, GABA, Ziziphi Spinosa Semen etc.; 6. Average daily caffeinated drinks intake of 5 cups or more (200ml/cup) , including but not limited to coffee, tea, energy drinks, during 4 weeks prior to screening, or during the study period; 7. Allergic or intolerant to the ingredients of the investigational products, such as protein allergy, dairy allergy, lactose intolerance, soy allergy and fish allergy etc. ; 8. The presence of drug abuse or alcohol and/or psychoactive substances abuse; 9. Those who work night shifts or perform unusal working hours; 10. The presence of medical, psychological or social conditions that may interfere with the subject's participation in the study or affect the evaluation of the study results at the investigator's discretion; 11. Pregnant and lactating women, caregivers of newborns unsuitable for trial participation at the investigators' discretion; 12. Participation in any other studies involving investigational or marketed products concomitantly or two weeks prior to enrolment; 13. Do not agree to sign the informed consent.