What are your anxiety levels like? Recently, I've realized that sometimes I feel exhausted not because I'm depressed or tired per se, but because I have a high level of baseline anxiety. Relaxation techniques like aromatherapy, drinking chamomile tea, warm showers with lavender bath gel, etc. help calm me down and rejuvenate me. This might seem funny, since chamomile and lavender are generally used to aid sleep. Anxiety uses up a lot of the body's energy, so if you can reduce that, you'll naturally feel more alert and energetic.