There's a few good techniques within yoga which may be of use to you:
Shavasana - Basic corpse pose, it's nothing spectacular but can be useful if combined with.....
Polarization - Which I can confirm is very effective for dealing with insomnia.
Or if you're feeling adventurous, there's
Yoga Nidra - Which is a bit more involved and uses a sort of guided meditation to bring one into a very deep state of consciously dreamless sleep which has to be experienced to be understood.
I know the sites linked to here aren't the best but they're just starting points if you want to look a bit deeper for yourself. The most useful techniques within this usual framework we use I can think of would be doing the "letting go" approach to the jhanas which Nick talks about
here. This always ends with a complete shutdown for me which, once I come back online, leads into a deep, restful sleep but I'm sure that at least some benefit can be achieved regardless of which Path you're at. Jhana practice in general is really nice before falling asleep so maybe even just trying that would be worthwhile.
Other than that, there's always over-the-counter sleep aids....

Hope you get some snoozin' soon mate, take care.