<prompt> Thiopentone does not cause:Fall in intracranial tensionDecreases oxygen consumption of brainDecreases metabolic rate of brainDecreases stage 2 of sleep  <response>: Thiopentone decreases oxygen consumption, metabolic rate and ICT. That is why it is agent of choice for cerebral protection. On sleep it increases stage 2 and decreases stage 3, 4 and REM. 