I'm not crazy about going to bed without washing either and ended up switching between CWC and CO every night. I think (at least for my hair) CO-ing instead of skipping washing was a good thing because it seems to be a gentler wash. That's especially helpful because when I tried stretching washes my scalp got really itchy.
"Even if the sky is falling down, I know that we'll be safe and sound" ~ Lady Mithrellas of the Cobalt Skies in the Order of the Long Haired Knights
I wash once a week, sometimes twice but my hair is in a bun or braid 99.9% of the time. If I wear my hair down a day or two I definitely need to wash sooner. Environmental factors like smoke, dust, dry or humid air quickly take a toll!
*SL APL BSLMBL WL HIP *