The effects of personalized light schedules during daytime hours on energy level and sleep quality of office workers

Completed

Conditions: daytime functioning and night time sleep
reduced alertness
sleepiness

Registration Number: NL-OMON36869

Lead Sponsor: Philips Consumer Lifestyle

Brief Summary: Not available

Detailed Description: Not available

Recruitment & Eligibility

Status: Completed

Sex: Not specified

Target Recruitment: 45

Inclusion Criteria

• Healthy men and women, ages between 25 and 45 years
• Indoor office workers with a 4-5 days working week
• Habitual working days of 8-9h with at least 3 hours of computer work
• In general the subjective energy profile over the day shows either a morning, a lunch, or an afternoon dip, characterized by increased sleepiness and lowered performance

Exclusion Criteria

• Psychiatric diagnose, e.g. mood disorder
• Sleep disorder (PSQI>10, mild sleep complaints are allowed)
• Alcohol or drug problems
• Depressive mood (BDI-II NL > 8)
• Regular use of photosensitizing medication, sleep medication or stimulant drugs
• Colour blindness or other visual impairment that is not solved with contact lenses or glasses
• On average more than 2 naps a week
• High levels of caffeine intake during a day (> 8 cups)
• Shift work schedule in the 3 months prior to participation
• Travel over 2 or more time zones in 1 month prior to participation

Study & Design

Study Type: Interventional

Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
<p>Subjective sleepiness and mood by rating scales. Rest-activity rhythms by<br /><br>activity meters and sleep characteristics with ZEO.</p><br>

Secondary Outcome Measures

Name	Time	Method
<p>Evaluation of well being and subjective ratings of performance over two weeks,<br /><br>Eye strain and headache complaints. 24h- light intensity. Chronotype<br /><br>measurements with rating scale. </p><br>