Thanks for using f.lux! We have a few questions to ask.
start
 
We want to know about your screen. Do you have a tape measure handy? (If not, you can guess.)

     
 
How big is the screen you usually use for bed (the "diagonal", in inches)?

If you have two screens, just answer the biggest one
 
And, how many inches is it from your eyes?

 
Does your screen usually dim itself when the light changes?

     
 
Do you dim the rest of the lights in your room?


 
How old are you (years)?

 
Do you usually go to bed at the same time every night?

     
 
When do you wake up, if you can sleep in?


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