Increase in Drinking (Water not Alcohol)
Dehydration causes the body to experience lethargy and tiredness so be aware of this. Feeling hungry and thirsty can give off similar messages, therefore keep your fluid intake high at all times, especially after you have been exercising to keep your energy levels stable.
If you are having alcohol at night and wake up tired in the morning it is worth reducing the alcohol intake as the alcohol disturbs the sleep pattern. You may think by being asleep for 7 to 8 hours you have had enough rest to boost your energy levels, but the alcohol affects your deep sleep. To ensure you achieve the energy boost you require, reduce the alcohol before you go to bed.