Gabapentin has had much less of a hangover effect for me with time. Back when I could know this I was on 400 mg at bedtime and finding that dose took a while with either too much or not enough sedation. Now I'm on 800 mg but it is probably too much combined with clozapine so I'll go down soon I hope since I'm not about to lower the clozapine dose. I've been all over the place with dosing and timing but it did work for me and before clozapine it was very, very important for me as a sleep med. I was on 1200 mg-1500 mg of Seroquel but it wasn't sedating like gabapentin.

I hope you find a magic spot and that you can balance sleep and fatigue. Just hang in there as your body may need less sleep after you get caught up somewhat; that happened for me on clozapine. I was completely exhausted on it and then needed less sleep after my body recovered for months of little sleep.