• Does this loss of sleep affect you the next day with respect to ...your tendency to be irritable?
• Does this loss of sleep affect you the next day with respect to ...your tendency to be irritable? (If yes, How?)
• Does this loss of sleep affect you the next day with respect to your ability to get your work done [PhenX]
• Does this loss of sleep affect you the next day with respect to...your ability to get your work done? (If yes, How?)
• Does this loss of sleep affect you the next day with respect to how much you eat [PhenX]
• Does this loss of sleep affect you the next day with respect to ...how much you eat? (If yes, How?)
• Does this loss of sleep affect you the next day with respect to your desire for chocolate or sweets [PhenX]
• Does this loss of sleep affect you the next day with respect to ...your desire for chocolate or sweets? (If yes, How?)
• Does this loss of sleep affect you the next day with respect to...your mood (being sadder or happier)? (If yes, How?)
• Do you prefer to keep a regular sleep schedule (i.e. one that does not change much from one night to the next)?
• If you do not keep your regular sleep schedule, how much do you feel ""off"" (i.e. not your regular self), the next day?
• Jet lag west PhenX
• Jet lag east PhenX
• Do you consider yourself to be a morning person ("early bird"), an evening person ("night owl"), or neither?
• How strong is your preference [PhenX]
• Does respondent consistently fall asleep very late - 12 a.m. or later, at night and characterize him or herself as a night owl with a strong preference [PhenX]
• At what time do you usually go to sleep - feel sleepy and ready to go to bed [PhenX]
• At what time do you usually wake up [PhenX]
• Do you wake up on your own, without an alarm or other assistance [PhenX]
• Force self asleep early PhenX