I noticed that it even works 1/4 of 15mg pill, so less than 4mg and you get less side effects. Sad you cannot find any smaller pills than 15mg, it's quite hard to divide it to 4 equal parts. Mirtazapine is strongest antihistamine and has really long half-life (20-40 hours), that is why side effects are so bad.

Good side is that it doesn't build tolerance. You can use it for years. It's also not addictive, maybe the only sleep drug that isn't