Re: Not a good idea for me.
There's also another reason: the pupil is no longer able to get as large as when you're young. Moreover, when the pupil is narrower, it helps with many eyesight issue. That's why I always hated dark themes, they are much harder to read.
Most monitors are too bright at the default settings. Mines are calibrated for photo editing, and the brightness is set to far lower values, compatible with ambient light, greatly reducing eye strain.