Grabbing a pen and paper and just writing whatever comes to mind is a good way of allowing your brain to let go of whatever it’s holding onto…
They also say that you should avoid stimulus just before bed, (like tv or, erm, internet sorry) and that you should definately not do these things in your bed room, which should be reserved as a place of rest (well, mostly!)
The other thing you can try is lying on your back, then working through your muscles from your toes upwards, tensing or flexing them, then releasing… if you do this methodically from the toes up to your face (scrunch it up, hold, then release), it can help tell your body you’re really ready to sleep and that it doesn’t need to be keeping you awake…
If this is just a one off bad night, then these things might help :)
I hope you’re already asleep though…