Meditation even just for 5 minutes can encourage mindfulness, stillness and reflection. Perhaps put on some calming music and close your eyes. Let the thoughts fall away from you and imagine a light. The focus will give you better rationale for decision making and encourage positive emotions.
Another tip is switching off social media a few hours before bedtime. The LED lights and screen brightness can disrupt sleep and can cause you to be more awake. Social media also can increase anxiety, so you want to be calm before sleep.
Ashwagandha helps deal with stress, calms the nervous system and also assists with memory. This will help you be at your optimum mental health level.