Study Description

    Sleep Duration, Study Time and Memory Performance
    What is the purpose of the study?
    In this study, we hope to learn the effect of sleep duration and study time on memory performance.

    Who can take part in the study?
    Healthy NUS undergraduates who are 18-25 years old, with a BMI between 18.5 and 27.5 kg/m2 can take part in the study. You must be a non-smoker with no history of chronic disease, and should not be taking any medications. Women who are pregnant or who have an irregular menstrual cycles are not eligible. You should not have history of shift work and you should not travel across time zones during the study period. To find out if you are eligible, we will ask you to fill out questionnaires that take about 30 to 40 minutes to complete. If you are eligible and willing to participate, you will be invited to take part in the research.

    How long is the study?
    After providing informed consent, you will come to the Chronobiology and Sleep Laboratory (CSL) for two study visits. During the first visit, you will stay overnight in the research suite at CSL located at the Singapore General Hospital (SGH) for 2 days. During the second visit, which happens one week after the first visit, you will come to CSL for a study session that lasts about 2 hours.

    What happens during the study?
    You are required to maintain a regular sleep-wake schedule of 8-hours of time in bed (TIB) (11pm to 7am) during the two weeks you are involved in the study. During the first visit, you will stay in a research suite that is similar to a small studio apartment, with a bedroom/study area and a bathroom with shower. Meals will be provided to you. There are no clocks, windows, radios, or anything else that would tell you the time of day. You cannot have visitors and you cannot make or receive phone calls. You will be asked to complete computer tests and learning tasks every 1-2 hours. You will be randomly assigned to either get adequate sleep (11 pm to 7 am) or short sleep (3 am to 7 am). You will not have much free time during your stay at the research suite. During the second visit, you will be asked to complete a cued recall tasks based on items you learnt during the first visit.

    Do I get reimbursed?
    Yes, you will receive $150 if you complete the screening procedures and both study visits. If you decide to quit the study early, there is no penalty and we reimburse you for what you completed.

    Questions: Please direct any questions about the study to

    Posted on: 1/22/2020
Please email to for more information if you are interested in participating.
© Chronobiology and Sleep Laboratory 2020