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Laying down was a large part of fixing my RSI. On a bed, on my back, head propped on a pillow, knees at a 45 degree angle, bottom of laptop laying on hip bones. This was my primary working position for a few years, and I didn't see any negatives.

"If you don't mind, could please tell me how do you lie down and work ?"

I have three "workstations" at my office - two of them take place at my adjustable height desk. I can stand or sit.

I also have a full sized couch that I can lie flat on. I prop my laptop up on a pillow just like you might at home.

I move between these three positions as it suits me and can avoid completely any kind of fatigue or unhealthy postures.

Take a look at zero g workstations.