They get more sleep

You don’t need a study to tell you that skimping on shut-eye could sap your energy levels. But a 2010 Society for Neuroscience study found that sleep may restore your brain’s energy on a cellular level, in the areas you use most when you’re awake. Getting enough sleep can help you wake up energised.
They drink enough water

Make sure you’re getting at least the eight standard glasses, and even more if you’re out in the heat or exercising. Does that sound too simple? Not according to numerous studies. In a 2012 study published in the Journal of Nutrition, researchers reported that even mild dehydration can leave you feeling fatigued and sap your energy levels.
Discover 10 ways your body changes when you start drinking enough water.
They give themselves a break

This is something productive people do regularly – take breaks – and they have tons of energy, right? So, could frequent breaks make you more productive and energetic? That’s what a University of Illinois study found – a brief break every hour could improve your focus and give you the energy you need to keep going.
Ideal for people who find it hard to stay still, walking meditation can be helpful for both your physical and mental health.