Effects of Nap Posture on Sleep and Cognitive Performance

Date Posted: 17/08/2026

What is the purpose of this study?

We are investigating the benefits of napping while seated in a chair. We are testing the effects of different seat recline angles on nap quality and post-nap cognitive performance.

Who can take part in this study?

• You must be 18-40 years old
• You must be in good general health (no diagnosed sleep disorders/chronic diseases)

How long is the study?

You involvement in the study is 12 days.

What happens during the study?

• You will attend a 1-hour information session to learn about the study details and to provide your consent to participate in the research.
• You will fill out a questionnaire about your background, sleep habits, and sleep difficulties that takes about 15 minutes to complete.
• You will be required to follow a self-selected sleep schedule at home with at least 7 hours of time in bed for sleep each night with a fixed bedtime and wake-up time.
• Your will wear a wrist-actigraphy watch and fill out daily diaries.
• You will visit our laboratory 4 times during the 12-day study period (every third day):
  • Each laboratory visit lasts several hours from about 10:00 am to 6:00 pm.
  • You will wake up 1 hour earlier than usual on days that you visit our laboratory.
  • You will be given a 1-hour nap opportunity while seated in a chair.
  • You will take tests to assess your cognitive performance before and after the nap.
  • Your sleep will be measured by electrodes placed on your head and face.

Do I get reimbursed for the study?

Yes, you will receive S$400 if you complete all study requirements. If you decide to end your participation early, there is no penalty and we reimburse you for the parts of the study that you completed.