ANSWER: Asana wakes up the lethargic mind. Pranayama like kapalabhati too freshens u up from sleepiness. For most meditators the biggest problem is sleepiness. This happens because the brainwave pattern changes in meditation from beta to delta. A good meditator can hold the brainwave pattern in alpha mode. But this is not a matter of choice but may take years of practice and focus. Till then using tricks like asana to prevent falling asleep is
QUERY: IS visualization same thing as meditation? What is the actual difference?