Keep disabled between sunrise and wake up
This is a variant of my earlier request Feature request: I'm up! but you might consider this easier and/or a bug. I am using f.lux version 39.984 on OS X 10.11.6
Today I got up before sunrise and wanted to stay up, so I chose "Disable until sunrise". So f.lux was disabled until sunrise. Unfortunately, at sunrise it kicked back in and dimmed and reddened the monitor because there was still over an hour to go until my wake up time. I can't imagine anyone wants that behavior.
Really I think the option should just be "disable until evening" which keeps f.lux disabled until it would normally switch to daytime/disabled mode and at that time clears the disabled flag.