Does your mood change your chess skills?

Chess is an objective game, but humans are inevitably emotional, or at least their minds are always changing states, like (mild) mood swings. 

I'm wondering if this changes your chess evaluation skills much? For instance, will not getting much sleep or something make your evaluations tend to be worse for you? and etc.

@ Cherub:

I'd be very surprised if it didn't, at least to a small degree.  But i'm betting things could swing quite a bit under certain circumstances.

I've been doing the daily exercises/games on the Lumosity app lately, and sometimes they ask you about your mood and the amount of sleep you got the night before.  I believe they let their paying members (i only use the free version) in on the info they've gathered on the subject.

It's probably pretty interesting and enlightening information, actually, as you're given a daily mixture of three games from a pool of about 15 or 20, and you play them over and over, here and there over weeks and months, getting better and better.  

I imagine one would soon be able to see a pattern on the days that they were in the happiest mood, or hadn't had much sleep, etc.

 neutral i tend to draw more. angry i tend to play more chess. sad i tend to not think about my moves. happy i play normally. worried i play less chess.when i'm in a serious mood i think longer and do more calculated sacrifices.

Same here

I think any deviation from neutral mood is likely to impair your decision making and calculation. Sleep and time of day is probably a big factor. It might be interesting to do an experiment with tactics trainer. Probably need a large sample to see the difference but I think there would be one.

I think any deviation from neutral mood is likely to impair your decision making and calculation. Sleep and time of day is probably a big factor. It might be interesting to do an experiment with tactics trainer. Probably need a large sample to see the difference but I think there would be one.

The mood has to have an impact on our thinking and behavior. It's coupled and dependent.

But another point I think is that rather young player try different things and can start very aggressive into a game.

Lack of sleep definitely make us likely to make errors. Anger, frustration, excitement, etc. could affect our calmness, so they could also make us venerable to errors. It also happens in the same match, if we make some mistakes. Some people handle these situations better than others. So it depends on player too. Unfortunately I don't handle excitement well. I am more likely to make blunder from winning position than equal. 

My calculator doesn't work as well when I am tried...and I'm a bit of a night owl....I lose at night and win it back during the day, so there is a balance there at least...

unfortunate is that if i loose i am quickly out of balane and i cobtinue to lose:(, then i lose again, i am feeling it right now to wonder why even keep playing. it seems i do this only for my son as he is just learning and needs someone to play with him because he likes it, so i try to keep up and not show that i give up easily but trust me...keeping losing changes my mood, even my wife see it:).

I am very emotional, I tend to lose when something does not turn

Yes! when I'm sharp and relaxed I hang around 2120 blitz here. When I'm tired and out of focus it tends to be 1980. 

Most of the time it's 2000s, though - either on the way up or on the way down.

instead win when everything is running smoothly

I play best when my mood is even-tempered (not too happy or unhappy).

I tend to fork more pieces when I'm hungry.

     In a recent study on judges researchers found that "the odds that prisoners will be successfully paroled start off fairly high at around 65% and quickly plummet to nothing over a few hours." The cause was found to be something extremely simple. Lunch! It turns out the accuracy of a judge's verdict is impaired when they are hungry and this has real life consequences on the defendants involved.  

     "This study underscores that decision-making is complex and does not occur in a theoretical or formalistic vacuum....the same applies outside the legal setting, to financial decisions, interviews, university admission decisions, medical decisions," and probably to chess.

     Personally, when I'm exhausted I make terrible blunders and obvious oversights. When I'm frustrated I go for the opponent's king without any nuance, patience, or tact which ultimately leads to my loss. When I'm depressed I don't try to be creative. When I'm anxious I mull over one move over and over for a long time, feeling as though I've hit a wall. Interestingly enough though, when I'm very excited and joyful I don't experience better chess. perhaps the calm viewpoint is the best.

It would be interesting to see a study on how chronic depression affects decision-making 

http://blogs.discovermagazine.com/notrocketscience/2011/04/11/justice-is-served-but-more-so-after-lunch-how-food-breaks-sway-the-decisions-of-judges/#.WPPVcdIrLIU

Of course

mood definitely makes a difference and lack of sleep

Yes it does.