When I’m tired or sick I’m more vulnerable to temptation. That’s just reality.
In order to be physically strong, I know I have to eat well, get to bed by a certain time and wake up at a certain time.
What happens when you don't get enough sleep? See here.
So when I get home from work I try not to sit down and watch TV. I do what I have to do as quick as I can. If I procrastinate—if I waste time—I’ll eat rubbish and get to bed late. And before I know it I’m in a downward spiral.
I also know I have to do some exercise.
I also try to eat well.
One of the most important things I can do in regards to eating the right foods in the right amounts is simply to ask myself this question before mealtime, "Am I hungry?" If I'm not hungry, I'll just have a very small amount of protein, carbohydrate, and fat, with some vegetables, and if possible, some sprouts. If I am hungry, I'll eat till I'm satisfied. (I also try not to eat between fixed times.)
Now sometimes it’s not possible to do all the things I'd like to do to improve or maintain my health. But even then I can do God’s will (See here). No matter how tired or sick I can seek to come closer to others; I say the Lord’s prayer first thing every morning and before going to bed at night. I also read one chapter from the Bible every morning and try to pray throughout the day.
The following are things which I found helpful (or interesting).