How do I tell f.lux what my bedtime is?



  • How do I tell f.lux what my bedtime is? There seems to be only one "preference" pane, andI can't see how to set bedtime.

    I have macos sierra 10.12.6



  • Unfortunately, you can't. You can only set when you wake up. IMHO, this is a huge downside to f.lux. It would nice to set bedtime and rise times, and thus have greater control of when the screen colours change.



  • F.lux switches into bedtime mode 9 hours prior to your set wake up time.



  • Yeah, but what's needed is the ability to set both when flux transitions to warmer evening and when it goes to cooler daytime.



  • Yes, I got that. I am simply showing you how f.lux works so that you can control when bedtime mode starts.



  • I believe the concept is for f.lux to nudge you toward healthy nights of sleep. It is easy to clear the effect if you are staying up late one night. You can also simply move your wake time out a bit past your actual wake time. But doing that or being allowed to adjust it so you can always sleep only 4-6 hours is defeating the purpose of the app.

    You are getting sleeeepy........



  • RickJohn57, I agree completely with you about f.lux helping us find and maintain a circadian rhythm. However, when I set my wake up time I want that time to be when f.lux changes over to daylight. Instead, it only uses the wake-up time for backwards alarm clock (which is a very strange way of saying "time to rise alert"). F.lux continues to use location sunrise time as the transition time to daylight colour. Of course, it's possible that I'm not understanding f.lux functionality correctly.


  • f.lux team

    Our schedule now is definitely better for people who are later than the sun, and we are working on a good solution for people who have to get up well before it (this is a lot of people during the winter).

    There are some cases where turning off the daylight cycle entirely isn't so helpful also...but we're trying to get the math to work for every case. It is super complicated and varies throughout the year and also based on some properties of your own clock, but we're making progress.

    But we think we are gonna crack it. :)



  • Thanks for the input!
    For guys like me who are already on solid circadian rhythms it would be helpful to be able to set bedtime and rise-time and then have f.lux transition based on that rather than location-based sunset/sunrise times.

    And yeah, like you say, latitude makes a huge difference. But, save for rare exceptions, I go to bed at 20:00-20:30 daily and rise at 04:30-05:00 no matter where in the world I am. For me, there's slight variation for season but not much anymore.



  • @lllusion said in How do I tell f.lux what my bedtime is?:

    RickJohn57, I agree completely with you about f.lux helping us find and maintain a circadian rhythm. However, when I set my wake up time I want that time to be when f.lux changes over to daylight. Instead, it only uses the wake-up time for backwards alarm clock (which is a very strange way of saying "time to rise alert"). F.lux continues to use location sunrise time as the transition time to daylight colour. Of course, it's possible that I'm not understanding f.lux functionality correctly.

    It's not going to switch to sunrise/daytime mode if your wake-time is set to a time before your local sunrise time. As an extreme example, let's say your wake-time is set to midnight. At that time, f.lux will transition out of Bedtime mode and go into Night mode. I mean, not to be rude, but think about it.



  • So the question is whether the goal of f.lux is to help people keep and maintain consistent circadian rhythms or match local sunrise/sunset? If the answer is the latter then this discussion is, perhaps, mute. But if there's an interest in the former then...

    Sure, sunrise/sunset is the basis for all life on earth, but i) nature starts to waken prior to sunrise, ii) science tells us that consistent rhythms are most important (to help get LOTS of sleep) and maintain health, iii) yogis, saints, and sages have taught for centuries that rising prior to dawn helps our energy. What's more, we know that humans don't change circadian rhythms as much as nature can/does to match seasons (esp. with increased distance from the equator).

    If MacOS Night Shift allowed app specific settings like f.lux does then I'd just use the OS feature.


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