I have a few ideas:

Instead of struggling to keep your eyes open, just relax and close them, allowing a new dream scene to form. All of a sudden, you are in a bright vivid dream scene with your eyes open and no problems at all.

Another possibility might be to imagine someone is in the room about to give you an injection that will make you instantly alert.

Maybe you could take that pill that you have in your pocket to wake yourself up?

Hopefully one of these ideas will work for you.