Have 7-8 hours of sleep every night. Make sure you are having enough sleep every night so that you wake up fresh and healthy ready to meet the challenges of the day.
Take a short afternoon nap. In case you went to bed the night before somewhat late, you can make up for it by taking a short afternoon nap ranging from 30 minutes to 1 hour. You will be re-energized doing your tasks happily for the rest of the day.
Drink plenty of water. Water is a free resource and it should be available in your office plentifully. Take in as many glasses of water as you can throughout the day. That way you keep yourself hydrated and full of vigor to work on your projects enthusiastically and productively.
Drink hot energy drinks. During breakfast instead of taking caffeine, take a hot energy drink. It will keep you upbeat and energized throughout the day so that you can effortlessly carry on with your tasks for the day.
Take a short leave from the office. When you see yourself short of focus and energy to get along with your daily office routine, take a short leave for 1 or 2 days. Have enough sleep, laugh and play and spend quality time with your family. You will regain energy and your mind will be fully aware to cope with your daily work tasks gracefully once again.
Take a prospective vacation. When the year has come to an end and you have worked hard enough at the office, feeling tired and drained out of energy, make sure to take a long enough vacation with your family to a distant quiet place so that by the time you return to your workplace, you are happy and eager to start all over again.