NCT07345767 · University of Arizona
Hypknowledge Nationwide Sleep Extension
What this study is about
The main goal of this study is to evaluate whether a manually determined sleep extension intervention is effective at improving sleep and related outcomes among adults who find it difficult to get enough sleep.
View original scientific description
The main goal of this study is to evaluate whether a manually determined sleep extension intervention is effective at improving sleep and related outcomes among adults who find it difficult to get enough sleep.
Interventions
BEHAVIORAL
Sleep Diary
Based on the participant's sleep diary data, a new weekly sleep schedule will be prescribed as follows: if sleep efficiency is \<85%, the prescribed time in bed is reduced by 15 minutes (reducing sleep opportunity by 15 minutes); if sleep efficiency is 85-90%, the schedule remains unchanged; if sleep efficiency is \>90%, the prescribed time in bed is increased by 15 minutes, allowing an extra 15 minutes of sleep opportunity.
BEHAVIORAL
Fitbit
Based on the participant's Fitbit data, a new weekly sleep schedule will be prescribed as follows: if sleep efficiency is \<85%, the prescribed time in bed is reduced by 15 minutes (reducing sleep opportunity by 15 minutes); if sleep efficiency is 85-90%, the schedule remains unchanged; if sleep efficiency is \>90%, the prescribed time in bed is increased by 15 minutes, allowing an extra 15 minutes of sleep opportunity.
Primary outcome measures
Sleep Duration
Time frame: 9 weeks from enrollment to the end of the study
Measured in minutes. It is trended from enrollment until the end of the study
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Be between the ages of 18-60 years old
- Have a typical sleep schedule of \<=6 hours per night
- Must have a FitBit device (any model) with Heart Rate Monitor
- Must have bedtime between 8 pm and 1 am
- Must have a waketime between 5 am and 10 am
- Must not have insomnia as determined by diagnosis or score on the Insomnia Severity Index (ISI), or must be treated.
- Must not have sleep apnea as determined by diagnosis or STOP-BANG scale, or must be treated.
- Must have a computer or smartphone device for daily sleep diaries.
- Must have an initial sleep efficiency of at least 85% as determined by sleep diaries and actigraphy.
Exclusion criteria
- Any condition that the PI considers would significantly impede participation in the study.
- Participant is under 18 years of age or older than 60 years of age
- Does not own a FitBit device with Heart Rate Monitor
- Sleep \>6 hours per night.
- Typical bedtime before 8 pm or after 1 am
- Typical waketime before 5 am or after 10 am
- Diagnosed with sleep disorders including insomnia or sleep apnea
- Diagnosed mental health disorder which may impact sleep (i.e. Bipolar Disorder)
- Taking medications that may affect sleep.
- Baseline sleep efficiency less than 85%.
Where
- Tucson, Arizona
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced May 14, 2026 · Source of record for eligibility and locations