Does anybody else ever have those days where you just feel braindead?

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Its not even a day for me, for the last few days now, i have been feeling somewhat braindead, not in like I cant think straight cause im having absolutely no problem with that, logical thoghts are actually coming to me pretty fast as is, but i find myself lacking in opinion the last 3 or 4 days now I havent been able to come up with an opinion on much I log into mylot and i'll see a number of things I want to respond to but i just cant think of anything to say I'll talk to one of my best friends on the phone and I feel lost, he even told me that I seem to be lacking in my usual insight I just seem to feel completely lost... does anyone else have days like this? this is a first for me