I suddenly lost my chess skills

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ManBananaGash
I played for like 3 consecutive days, tournament in my school is about to starts and ofcourse I practiced, and practiced to the point now I'm blundering, that's kind of counterintuitive because I thought I would get better, but I lost my vision, tactics and overall my play. I keep blundering pieces that normally I wouldn't do but here we are. Can I please have an explanation why?
justbefair

You need sleep.