Support for you or your ideas, desires, comfort, preferences, or sense of self
Rest or a rest period
Sleep, being asleep, or being unaware
Being unproductive or ineffective (as in "sleeping on the job")
Dreaming that your pillow is taken away or you have no pillow can mean you're feeling a lack of support, or possibly a lack of respect, from others or from yourself in your life somehow.
Having to sleep on an uncomfortable pillow can mean:
You might benefit from paying more attention to your self-support and attention to yourself and your needs right now, or more attention to gaining or accepting support from others
You're feeling uneasy or something is bothering you, as in "keeping you up at night"
Possible dream symbol meanings in the dream dictionary are suggested. No "standard meanings" exist because dream meaning is subjective and specific to the dreamer.