I wake up between 4-5AM every single day of the week, and all year long. I don't even need an alarm clock. I can go to sleep at anytime

• No screen before bed. No computer, no phone, no tablet, no TV (we don't own a TV, so we don't have much choice here ;). What do I do instead? I read a book, journal, write, chat with my spouse or friends, play chess or board games,... I do various stuff just not on a screen. Not even using a Kindle.
• No coffee in the evening. No alcohol at all (evening as well as in the day: I was an alcoholic many, many years ago). No soda either. Either I'll drink water or herbal tea.
• Light & healthy diner. I don't stuff my stomach, don't eat garbage pre-packaged industrial 'food' either (this alone was a huge change for me, the day I quit eating that absolute turd a few years ago and my health has jumped through the roof, pre-packaged food is just poison in a fancy packaging and a lot of marketing, I would not be surprise if it was to become the tobacco of the XXI health-wise).
• No snacking, no candy, chips, or whatever.
• At least one long walk during the day. Every day.