Don't put things off until the last moment. This is called managing your activities by continual crisis which will put you under continual high stress. Some stress can be a stimulus for higher achievement. If you were not under some stress, you probably wouldn't do your best. Look at athletes as an example.
Stress gets the adrenaline working.
The problem comes when we put ourselves under too much stress. Everyone has a certain level of stress. Above this level an individual will defeat their purposes. It has been shown that unduly high stress produces high blood pressure and aggravates other stress related diseases such as arthritis. This life is short enough as it is.