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I woke up at 8 today, that means I slept for only 6 hours last night.

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I woke up at 8 today, that means I slept only 6 hours last night.

Sleep vs sleep for? Which one is correct? I often hear people saying "I slept x hours." Is this correct? Or is For necessary?

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Both seem to be used in more or less the same meaning. "For" is not necessary but may be used. Google results suggest that "for" is rather more common.

The participants that slept six hours each night were cognitively impaired.

Those who slept for six hours kept mental abilities at a high level until about the tenth day of the experiment.

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