Hard to give much advice without knowing much about your lifestyle, but I try to prioritise sleep above all else. If I need to be up at 6am, I’ll make my herbal tea at 8pm and start winding down, be in bed by 9.30 so I can read a bit and be sure I’m asleep by 10. If I’m having trouble sleeping I’ll look at cutting caffeine completely, and/or no screens before bed. The other part (for me) is physical activity/ exercise. It’s hard to get started when you’re exhausted, but once it’s a habit, it gives you more reserves. And improves your sleep.