Dunno if this helps, but here's what I do...
While lying in bed I'll find a comfy position, stay COMPLETELY still, close my eyes and think...
" Basic One... Turn Left Forward Stance, Low Block"
While visualizing every movement, but not as if I was doing the form, but watching someone else do it. Usually I'm out before I get to the Taegeuks.
Be warned though, when I visualize Taegeuks 5-8 I usually get the urge to get up and do the form! Koryo doesn't do ANYTHING to put me to sleep either, it wakes me up :uhyeah:
PS: I'm not trying to say that forms put me to sleep! I find that mental repetition without any actual activity will calm me. (Maybe just basic 1!)