so because blue light on screens affects sleep

http://www.youbeauty.com/health/colu...onin-and-sleep

http://www.fitsugar.com/Better-Sleep...-Light-2037593


I decided to adjust the screen on my pc and android phone by adding a red filter on it at night https://play.google.com/store/apps/d...91cnNjcmVlbiJd

and it did improve my sleep (not that I have bad imsomnia and sleep really late, but it is definitely more pleasing to the eye during the night). I was wondering if there was a way to do something like that on the n900?

How about just switching the damn thing off?

That wasn't very nice. I wasn't being facetious at all. I don't want to fall asleep at the screen so whatever helps me to stay awake is good. After that, I just switch it off and/or move to the room without the disturbing light.

it's not about falling asleep at the screen it's about a more pleasing screen for the eyes at night time (edit: coffee helps stay awake too but you're better off having some horlicks, do you understand?).

where I live it can get dark at 6pm, and adjusting the blue off these screens is much nicer mostly if it's only for reading or writing

There is a thread that discussed changing the colour profile on Harmattan, it might be apllicable to Fremantle too:
http://talk.maemo.org/showthread.php?t=89646

I'm making the app for Harmattan but the same principle cannot be applied to Fremantle.
Find me a way to influence LCD light intensity and I'll make an app.

for writing if I adjust the background of the editor to blue is not the same?

ooo...and what kind of music shoud I listen?

I don't know if it's possible to do this but here is a suggestion:

A blank image (of any color you chose) that would fill the whole screen, and which you can adjust its transparency.

e.g so the dashboard



with this on top



at 70% transparency gives this:



with mieru:





EDIT: here's with a black image overlayed at 30% transparency


(this can make it dimmer than n900's lowest brightness setting while still readable)


It's basically how Screen Filter for android works (and why it doesn't require root)