Real Simple has a useful series on raising your energy levels that covers every part of the day. In the morning, they suggest opening your window to let in natural light and then doing a light work out. At the office play occassional brain teasers online to stimulate your thought process and take periodic short walks to get your blood flowing. In the evening, take a hot bath and watch relaxing television so you can get a good nights sleep that will provide you with ample energy the next day. Original Source – Real Simple