So it's day 4 on Lexapro, and I think I'm getting the insomnia side effect from it. I'm sick with allergies and was super super tired last night but only ended up sleeping about 2 hours, and tossing and turning the whole night! Does anyone know how long it takes for the insomnia to go away? I saw someone mention Fatal Familial Insomnia Syndrome and now my HA is freaking out that I might develop it, but I'm wisely keeping away from the Google.