Whatever action is described in the script, readers should try either to do it or else to suggest it through mime. If someone is eating, we should see the fork carried to the mouth. If someone is hanging in the air, we should see the arm pulled tight by the floating balloon. If someone is racing a horse, we should see the galloping hooves. For instance, it's hard to take off a coat realistically when one hand holds a script.
Readers quickly learn to sleep sitting up, with their heads bent to the side.
And walking in place is a reader's favorite mode of travel. Though formal mime techniques aren't required, they do add polish to a performance. It's always good to draw on proven tricks for walking in place, climbing up or down stairs or ropes or ladders, lifting or pulling heavy objects, flying, falling, and so on. Look for library books on mime, or invite a local mime to conduct a workshop. Part of successful group mime is being aware of the invisible.