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POWER SIMULATION -- unmerge_d0_13   [metric: success RATE]
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model: behavior ~ stim + day + stim:day + (1|rat)   (behavior = success RATE; day within-window)
observed groups: stim n=3, control n=3   nrep=120, alpha=0.05
ground truth: stim:day=+0.01125/day, rat SD=0.03898, residual SD=0.0934, days=14

 true stim:day interaction = +0.01125 (100% of observed)
  N/group  | per-animal power | LME power
  ------------------------------------------
  3        |  0.28            |  0.66  <- observed
  5        |  0.67            |  0.78
  8        |  0.92            |  0.94
  12       |  1.00            |  1.00
  16       |  1.00            |  1.00
  24       |  1.00            |  1.00

 true stim:day interaction = +0.005624 (50% of observed)
  N/group  | per-animal power | LME power
  ------------------------------------------
  3        |  0.15            |  0.25  <- observed
  5        |  0.23            |  0.25
  8        |  0.48            |  0.52
  12       |  0.56            |  0.60
  16       |  0.75            |  0.79
  24       |  0.87            |  0.83

Read the per-animal column as the honest power; LME is optimistic (obs-level DF).