"when we dream of running, do we activate the same regions that are busy during a race, for instance? [E]arly experiments suggested yes, but somehow they seemed to be strangely drawn out.
So, inviting some skilled lucid dreamers to his specially equipped sleep lab, he asked his subjects to perform various kinds of tasks during their dreams: once they had gained lucidity, they had to walk 10 paces, count to 30 or perform an elaborate gymnastics routine, for instance. To time the duration of their actions, he used a peculiar aspect of the dreaming mind: although the body is paralysed, eye movements tend to be translated to the body. In this way, the subjects could signal the start and end of the actions by rolling their eyes left and right a couple of times. Along the way, Erlacher measured their brain activity and muscle movements, to be sure they weren’t just pretending to be asleep.
As he expected, the dreamers sometimes took up to 50% longer to complete the routines than you would in real life, suggesting that they were somehow playing out their tasks in slow motion, even though they didn’t realise it at the time. “They reported that it felt exactly the same as in wakefulness,” says Erlacher."

http://www.bbc.com/future/story/20141125-do-dreams-occur-in-slow-motion

principā es atceros, ka vēl kaut kur savulaik lasīju, ka daudz kas no šī dīvainā/panikainā "ķermenis nestrādā kā vajag!!!" sapņos saistīts ar to, ka miegā muskuļi lielā mērā tiek "paralizēti", lai mēs nesadarītu visādus brīnumus, bet smadzenes to daļēji arī piefiksē, un tad rodas tāds paradokss