10 minutes pranayama, 20 DM, followed by 5 minutes rest. Is it necessary to do nothing during the rest period? Is it counter-intuitive to noodle around on my guitar for 5 minutes after meditation? Or draw for 5 minutes?
The rest period is a period of rest before we engage in any activity. So things like playing the guitar or drawing, would be activity done after rest.
In retreat mode the rest period has to be lying down, either in savasana or lying on one side of the body. When not in retreat mode the rest period can be done either lying down or sitting.