Sleep, Chronotype, and Prosocial Allocation Decisions
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Sleep, Circadian, and Prosocial Allocation Assessment.
- Who it may be relevant to
- Registry conditions: Sleep Quality, Chronotype, Prosocial Decision-Making, Circadian Timing. Basic parameters: from 18 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Hong Kong
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
Unsure about the terms? Read our patient guide →
Official title
Associations Between Sleep Quality, Circadian Timing, and Prosocial Allocation Decisions in Adults
Overview
This observational behavioural study examines whether individual differences in sleep quality, sleep timing, and chronotype are associated with prosocial allocation decisions in adults. Participants will complete self-report sleep and circadian questionnaires, including the Pittsburgh Sleep Quality Index and the Munich Chronotype Questionnaire, a 7-day sleep diary, and a brief computer-based Dictator Game allocation task. The study does not involve sleep deprivation, sleep restriction, treatment, clinical diagnosis, medication, or medical devices. Participants will not be asked to change their sleep schedule. The Dictator Game decisions are hypothetical and do not affect participants' compensation. The study is intended to describe associations between naturally occurring sleep-related individual differences and behavioural allocation choices, not to diagnose or treat sleep or mental health conditions.
Detailed description
This is a non-clinical observational behavioural study of adults aged 18 years or above. The study investigates whether naturally occurring differences in subjective sleep quality, sleep timing, and circadian preference are associated with prosocial decision-making in a computer-based allocation task.
Participants will first provide informed consent and will be assigned a participant code so that research data can be pseudonymised. They will complete demographic questions and sleep-related self-report measures. These measures include the Pittsburgh Sleep Quality Index, which assesses subjective sleep quality over the previous month, and the Munich Chronotype Questionnaire, which assesses sleep timing on workdays and free days and provides chronotype-related variables. Participants will also complete a 7-day sleep diary recording daily sleep-related information such as bedtime, estimated sleep onset, wake time, rise time, naps, subjective sleep quality, and schedule-related information.
Prosocial allocation behaviour will be assessed using a brief computer-based Dictator Game task. In this task, participants make hypothetical allocation choices involving distributions of money between themselves and another party. No deception cover story will be used. Participants will not be falsely told that they are interacting with a real paired participant if no real allocation exists. Dictator Game choices are hypothetical and do not affect actual compensation.
The primary aim is to examine associations between sleep quality, sleep timing, chronotype-related measures, and prosocial allocation behaviour. Secondary analyses may explore whether 7-day sleep diary measures provide additional information beyond retrospective questionnaire measures. Exploratory analyses may examine whether chronotype, sleep timing, or time of day moderates associations between sleep-related measures and Dictator Game behaviour. These analyses will be interpreted cautiously and will not be used to make clinical claims.
The study is not designed to diagnose, treat, or induce any sleep disorder, mental health condition, or other clinical condition. The PSQI, MCTQ, and sleep diary are used as non-diagnostic research measures. No clinical diagnosis, treatment recommendation, or personalised sleep advice will be provided. The expected risks are minimal and may include mild boredom or tiredness, mild discomfort when reflecting on sleep habits or making self-other allocation decisions, minor inconvenience from completing the 7-day diary, and privacy concerns about sleep schedule information. Risk will be minimised through informed consent, voluntary participation, the right to withdraw, non-clinical wording, pseudonymisation, separate storage of identifiable records, and restricted access to research data.
Interventions
- Other Sleep, Circadian, and Prosocial Allocation Assessment
Participants complete non-diagnostic sleep and circadian self-report measures, including the Pittsburgh Sleep Quality Index, the Munich Chronotype Questionnaire, and a 7-day sleep diary, followed by a brief computer-based Dictator Game allocation task. This is an observational assessment procedure only. Participants are not assigned to a treatment, sleep manipulation, sleep deprivation, sleep restriction, or behaviour-change intervention.
Primary outcome measures
- Dictator Game Prosocial Allocation Score [Time frame: Day 1 (single study session)]
Secondary outcome measures (3)
- Pittsburgh Sleep Quality Index Global Score [Time frame: Day 1 (single study session)]
- Chronotype (Sleep-Corrected Mid-Sleep on Free Days, MSFsc) From the Munich Chronotype Questionnaire [Time frame: Day 1 (single study session)]
- Mean Sleep Duration From the 7-Day Sleep Diary [Time frame: Daily for the 7 days before the study session (Days -7 to -1)]
Eligibility criteria
Inclusion criteria
- Aged 18 years or above.
- Able to provide informed consent.
- Able to understand English or Chinese study materials.
- Able to complete computer-based behavioural tasks and self-report questionnaires.
- Willing to complete a 7-day sleep diary.
Exclusion criteria
- Aged under 18 years.
- Unable to provide informed consent.
- Unable to complete study materials in English or Chinese.
- Prior participation in the same study.
- Self-reported condition or circumstance that would make participation in a brief computer-based decision-making task or sleep-related questionnaires inappropriate or distressing.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Observational model
- Cohort
Study locations
Hong Kong · 1 center
- The Hong Kong Polytechnic University — Hung Hom
Publications
- Brocklebank, S., Lewis, G. J., & Bates, T. C. (2011). Personality accounts for stable preferences and expectations across a range of simple games. Personality and Individual Differences, 51(8), 881-886. https://doi.org/10.1016/j.paid.2011.07.007
- Forsythe, R., Horowitz, J. L., Savin, N. E., & Sefton, M. (1994). Fairness in simple bargaining experiments. Games and Economic Behavior, 6(3), 347-369. https://doi.org/10.1006/game.1994.1021
- Ben Simon E, Vallat R, Rossi A, Walker MP. Sleep loss leads to the withdrawal of human helping across individuals, groups, and large-scale societies. PLoS Biol. 2022 Aug 23;20(8):e3001733. doi: 10.1371/journal.pbio.3001733. eCollection 2022 Aug. PMID 35998121
- Carney CE, Buysse DJ, Ancoli-Israel S, Edinger JD, Krystal AD, Lichstein KL, Morin CM. The consensus sleep diary: standardizing prospective sleep self-monitoring. Sleep. 2012 Feb 1;35(2):287-302. doi: 10.5665/sleep.1642. PMID 22294820
- Roenneberg T, Wirz-Justice A, Merrow M. Life between clocks: daily temporal patterns of human chronotypes. J Biol Rhythms. 2003 Feb;18(1):80-90. doi: 10.1177/0748730402239679. PMID 12568247
- Buysse DJ, Reynolds CF 3rd, Monk TH, Berman SR, Kupfer DJ. The Pittsburgh Sleep Quality Index: a new instrument for psychiatric practice and research. Psychiatry Res. 1989 May;28(2):193-213. doi: 10.1016/0165-1781(89)90047-4. PMID 2748771
Identifiers
NCT: NCT07697092 · HSEARS20260629007