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When you first wake up, you may have a creaky or cracking voice. This is caused by slow and uneven vibration of your true vocal cords. This buzz or hum that is found in your voice is what vocal fry is. Practicing the technique when you first wake up is easier if you've never done it before. Use the least amount of air as you can to vocalize the grumble. This cracking sound is what it should sound like when you are doing vocal fry. Isolate your vocal cords, and try to increase the sound of this grumble. You should feel your vocal cords vibrate in your throat. Adjusting the pitch of the fry will help you control it. Try slowing down the tempo of your fry and using less and more air to create it. Continue to practice until you have control over it and can adjust it whenever you want to.
Practice vocal fry when you first wake up. Open your mouth and grumble. Adjust the pitch of your fry.