Hi,
I have an un-SFQ related suggestion, as an ex-insomniac. If you're not sleeping through the night, the absolutely incredible solution can be found at centerpointe.com - the holosync solution. I started sleeping so deeply from day one, it's just been amazing.
No, this is not a commercial - just the truth.

) It works well as a companion to SFQ too. There's an online audio sample if you want to check it out.
I hadn't slept well in years, and now I very rarely have a bad night.
As far as SFQ goes, I think everyone's different, but as a dance instructor, I know that anything that's intensely focused should not be done right before bedtime. A few folks will do well with that, but many can't relax out of the focus, so trying something you find especially soothing might be best, or doing your practice at least an hour before bedtime.
Good luck!