My first app, it's pretty basic and the UI could use some work but it works well which is what really matters right? I personally used it on my long Labor Day drive and it kept me awake. The app will give you a gentle but firm alert at random intervals to ensure you are still awake. I welcom all constructive feedback. Thanks.
https://market.android.com/details?id=com.KeepMeAlert
https://market.android.com/details?id=com.KeepMeAlert