Does sleep deprivation...

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reduce iq tests scores????

IQ score on standardised tests can be reduced by:

- sleep deprivation
- having a bad day
- not taking the test seriously
- having certain psychiatric co-morbids (side effects of anxiety, depression...)
- having a cold or whatever other sickness
- feeling bad (angry, annoyed, stressed)
- not wanting to do the test
- being overly worried about the IQ score/results
- if the language the test was administered in isn't someone's first language
- if someone has general problems with speech or language and takes a test in which they are required to use and understand language
- having a different intelligence than other people (because of autism...)
- having special skills that the test doesn't test for (musical genius, maths genius...)

I think I got a good number of the reasons covered.

You missed out PMT and hormonal fluctuations after having a baby.

But I've got to ask the OP... how many times are you going to ask this question? Is this the fourth already?

You did your test when sleep deprived, in your second language. Of course you got a lower score.

Can't you let it go? Why not just wait until you have an opportunity to do a proper test in Greek, after you've had a decent nights sleep? And if you decide to do that, try not to obsess about the result before hand... stress and panic may also have an impact on how you do.

Other influences are:

- practising with a similar test
- not a balanced test


But having not enough sleep is a problem in general, my performance on my job goes down when not having enough sleep. At some point you just have to take steps to get enough sleep!