I'm feeling really dumb today. Do you have days like this? How do you deal with it?

The only problem is externality pricing.

Building https://negationgame.com

Yes, and I think this is a feature, not a bug. We're not built to be always on. Deal with it using self-compassion, mindfulness, space, and healing work like IFS.

I personally find this flows from (inconvenient) suppressed needs, e.g. there's a part of you that's not being consulted and/or getting its needs met.

i have these brain fog days that i can't explain

i learnt to accept them and take it easy

coffee sometimes helps but one should only consume caffeine before noon (otherwise rem cycle is screwed in the night)

so if brain fog strikes in the afternoon i just do routine things that don't require mental capacity