I remember the first time I had a code block, I sat on my desk for up to 18 hours trying to fix it. In the end realizing that my impatience is not helping me. It was all in vain. A tired mind did not help.

I finally came to realise that I was lacking on knowledge and a tired brain did not help. I did it the next day but learnt a huge lesson. When it's just not your day, it's not you day. A fresh mind will help next day. Relax, do anything apart from code.

Too much of code can drain you of ideas and smartness. You need to let your mind breathe. Life away from the PC is important too.