The mites that cause scabies are tiny parasites, smaller than a pinhead. They are usually picked up by direct skin-to-skin contact with someone who already has scabies, and only very rarely from objects such as clothing or bedding.
The most memorable and emotionally powerful dreams happen during the REM (rapid-eye movement) phase of sleep, which is the stage of sleep when our brains are most similar to a wakeful state.
Stage 2 sleep is signaled by the appearance of sleep spindles and/or K complexes in the EEG. The sleeper is more difficult to arouse in this stage; a stimulus that would produce wakefulness from Stage 1 will often evoke a K complex in the Stage 2 EEG, but not a complete awakening.