Why do I feel like I’m getting stupider everyday (Vent)

This isn’t a self esteem issue or anything I just feel like I’m getting dumber everyday and my brain is melting. I feel like I’m losing my wittiness and I’m probably the most boring person to talk to in a one on one conversation now and probably couldn’t keep one going either. I don’t feel as creative and I just kind of don’t think about things as much as I used too. I feel kind of disconnected from everyone too I just kinda feel more stupid more often. I’m still good friends with people but I’m the last person to get invited to things. I just feel like my brain is melting and just isn’t working like it does for other people. Am I becoming an introvert or am I becoming autistic or a robot. Could this be a sleep deprivation issue or what could be causing this in me?