Affirmations are simple statements you say to yourself that place positive ideas and suggestions into your brain.  The key is in frequent repeating of these positive statements, preferably out loud, softly, to yourself - so that your system can absorb these thoughts and come to act on them automatically.

Use the following affirmation to improve your health:
I take care of myself; I eat balanced meals regularly even if I am not hungry.  I take frequent rest breaks and drink 6 – 8 glasses of water; I take walks, breathe deeply, and include exercise in my daily routine. 

Use the following affirmation to help you sleep:
As I release my emotions, I am feeling more and more relaxed; all the muscles in my body are relaxed; I am feeling more and more relaxed and I am getting sleepy; I give myself permission to fall asleep.