I did some researching after reading some of the posts here. I don't think I'll be taking it anymore.

Instead, I'll be taking magnesium.

I took it when I was getting a constant lump-in-the-throat feeling. I noticed then that I slept really when when I took it so I'll go back to taking that.

Failing that, I also found GABA quite helpful in calming the mind (and lessening headaches as it relaxes tension).

I actually have quite a few little secrets up my sleeve when it comes to sleep (valerian/hops/L-theanine/Relora, etc).