Sleeping with lower room temperature, or thinner carpets. Make your sleep-temperature different, preferably colder. Just not dangerously cold.

You could also try sleeping different lights, maybe coloured, or just repositioned.

If you want to try something really extreme, try hanging some threads down from your ceiling. Not too long, but just enough to reach your face, perhaps lie a bit on it. That would definitely highten awareness, but might also wake you up