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The purpose of this study is to systematically examine the impact of different intensities of daytime light and the subsequent impact that such exposure has on non-image forming responses to light in the evening.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Low room | Experimental | Low intensity (80 lux) room light |
|
| Normal room | Experimental | Normal intensity (150 lux) room light |
|
| Bright room | Experimental | High intensity (500 lux) room light |
|
| Bright | Experimental | Very high intensity (1000 lux) room light |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Light | Behavioral | 10 hours of light exposure during the daytime, starting 2 hours after habitual wake time |
|
| Measure | Description | Time Frame |
|---|---|---|
| Suppression of melatonin production | Difference in salivary melatonin concentrations between active arm and 3 lux control condition | 4 hours |
| Phase shift in the timing of melatonin onset | Change in the onset of melatonin secretion after experimental stimulus | 2 days |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Jamie Zeitzer, PhD | Contact | 6504935000 | jzeitzer@stanford.edu |
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| VA Palo Alto Health Care System | Palo Alto | California | 94304 | United States |
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| ID | Term |
|---|---|
| D008027 | Light |
| ID | Term |
|---|---|
| D060733 | Electromagnetic Radiation |
| D055590 | Electromagnetic Phenomena |
| D060328 | Magnetic Phenomena |
| D055585 | Physical Phenomena |
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| D055620 | Optical Phenomena |
| D011827 | Radiation |
| D011840 | Radiation, Nonionizing |