Plot uncertainty in lmer predictions

Hi everyone. I have just started using R a couple of months ago, so I have a
lot to learn yet.
Anyway, I have fitted a linear mixed model for my data, with variable
intercept and slope. I would like to plot the median estimate (wich I
already know how to do) and uncertainty in the regression by plotting some
simulations.
I would really appreciate if anyone could tell me how to get those
simulations and plot them.

Thanks

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