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Agreed. Many a late sleepless night have I blown 200 points or more on frustrating blitz games. I would regularly play a game or two during lunch breaks, climb a good bit, then stay up too late one night and rage throw my points into the abyss.

I think it's an inverted U curve.

Games that require fast response and planning suffer on one extreme, and abstract thinking games like chess suffer on the other.

The real question is whether this penalty goes away once you adjust to your new sleep schedule.