This is a great video outlining the effects of using the snooze button. Some key points to take away from this are:
1. Set your alarm later rather than hitting the snooze button 3-4 times. This will help prevent that sluggish feeling later in the day.
2. Develop a regular sleep pattern. This can be done by going to sleep and waking up at relatively the same every day.
3. Resist the snooze button, even if you are still feeling tired, GET UP!