My three favourite sleep meditations, that I realise may sound terrifying to some:

• You're on a hospital table. They're removing parts of your body, slowly, in silence; they're removing the rust, changing some wires, oiling. You can't feel anything because you lack parts of your body. That's okay, they're oiling them, they're cleaning them. They'll come back. Don't try to feel anything, there's nothing to feel.

• You're falling asleep in quicksand. It's so comfortable and you're so sleepy. Let go to the sleep, let go to the sand. As you breathe in, the sand gets into yout body, slightly filling you, crushing you. As you breathe, you become more and more sand. You're crumbling, the thoughts are crumbling.

• You're in the water, face up, a slight wind over you. Slowly, silently, your body gets heavy and it starts to go down. Deep in the silence and in the dark, your body get cradled, gently and slowly. Down, down, down. More dark, more silent. Gently.