@paul_freeman What a great list of things to try out!
One which works for me is doing an A – Z in my mind. You choose any topic or theme and simply find a word for each letter. I have no idea how it works but I rarely get beyond ‘F’ before conking out. Last night it was DMD related: Avonex – Beta-Interferon – Copaxone – Drug – zzzzzz, the other day it was rivers and related words so Avon – Bank – Confluence – zzz. Topics I’ve chosen range from mindfulness (Acceptance – Breath – Calm – zzz) and colours to weather, holidays etc.
So a strange one but worth a try? 🙂