Primarily work and are awake during normal daylight hours (6 am to 6 pm), or primarily work and are awake during night shifts hours (between the hours of 6 pm and 6 am) or may work a mixture of these shifts over the past 3 months. Rotating shifts will be categorized based on the majority of hours worked on average during the last 3 months. Able to fill out a 3-month calendar of work schedule.
You may not be if
Known photosensitivity
Currently on photosensitizing medications
Diabetes Mellitus
On any hormonal agents (e.g., birth control pills)
History of abnormal scarring
History of skin infections
History of skin cancers
History of sleep disorders such as sleep apnea or insomnia
