After weeks of poor sleep, we gave melatonin a try with Mira. We gave her 0.5mg (very low dosage) before bed last night and she slept from about 7:30pm to 4am, even with daylight savings time! That was probably the best night of sleep she has had in weeks. She did get up crying at 4am, so we gave her another 0.5mg and she slept in another few hours.
We haven't seen any sort of withdrawal symptoms after stopping the ethosuximide, nor have we noticed any spike in seizure activity, which is all very promising so far. Let's hope she can go two nights in a row!