Reply to Inspiration

So I know for me inspiration hits at some of the strangest times, mostly at evening when I should be sleeping.
Be it for mixing or production which I do also and if I don't capture it at that moment sometimes I don't even remember what I was even believeing about.

Like some people I have to get up in the morning and go to work. Or sometimes I have to get up real early like tomorrow and take my wife for chemo treatments and such.

So what I was wondering was for those of you who do experience this how do you handle it?
Do you have a way to quickly sketch an idea or make notes of your idea?
Do you ever avoid doing something with that inspiration because you know you should be sleeping?
Do you set a time limit on how long you will work on that inspiration so you can ultimately get some sleep?
Etc...

I experiencing insomnia because of this most evening s.

I can't be the only one who goes thru this.

For those of you who can grab hold of your inspiration without worrying about having to get up the following day I am a little jealous, not gonna lie.