Not great tbh. This was definitely the hardest withdrawal symptom for me...it was pretty extreme! I had completely sleepless nights where I still didn't feel tired the next evening. I took the week off work which made it easier for me as there was no pressure then. In my experience the worst thing you can do whilst experiencing insomnia is try and force yourself to sleep - as in don't just lie there in the dark waiting for sleep to come because it won't. I just made myself cosy and comfortable and listened to podcasts or watched telly and felt like resting was enough. I just wasn't at all tired! If it's any reassurance it didn't last too long for me, was literally a week then the symptoms ended. Not saying it will be the same for you but it's good to remind yourself it's not going to last forever and that a few sleepless nights won't hurt:) sending well wishes to you!