Revital is a nutritional supplement and generally indicated in nutritional deficiency. It is not for providing energy. Energy is provided by carbohydrates. You are working under pressure and reading late night which is bad for health. You can’t continue this habit for long term. Save some time for your health also. Advice 1. Revital – once daily any time after meal for one month 2. Sleep at least 8 hours in night 3. Avoid late night reading 4. Regular exercise at least 30 minutes for 5 days in a week 5. Eating a diet that is rich in whole grains, fruits, vegetables 6. Avoid smoking, alcohol, coffee and caffeinated beverages 7. Reduce metal stress because mental stress causes mental fatigue I hope this information will help you. I will be happy if you ask another question Thank