Thanks Guys,
I've been diagnosed with TMJ dysfunction. The muscles of my head and neck are all in spasm also causing a very high freq tinnitus. Most nights I've been able to sleep eventually but all in all its fatiguing. Hence the request about sleeping tabs.
The dentist is making up a mouth guard although I'm sceptical. Will give it a go.
In the meantime the doc has given me Zopiclone.