Hydroxazine is an antihistamine (in the same family as diphenhydramine) which is frequently prescribed for anxiety relief and as a sleep aid. It is safe and usually well tolerated. While there is addiction potential like there is for diphenhydramine, it is far far less addictive than benzos. An adult can safely take up to 100mg up to 4 times per day for anxiety relief. I can't find dosages for insomnia anywhere but that probably because most people get completely knocked out by 30-50mg let alone 100mg. For reference, I'm a 260lb dude and 50mg will take me from anxiety attack to entirely unconsious in less than 30 minutes; a friend of mine says 25mg is enough to knock them out. Being an anticholinergic drug it isn't great for long term use but it is still a whole lot better in that regard than benzos.

I know from my mother who is a nurse midwife that high dosages of hydroxazine are frequently given to women in labor when it's going to be several hours until the baby actually starts ariving to let them sleep through most of the labor. If it can make someone sleep through labor pains I can't imagine insomnia it couldn't handle.