Be Poised and Skillful
Practice [meditation] once or twice a day. Early morning meditation will enable you to be poised and to more skillfully perform your duties during the day. Late afternoon or early evening meditation will reduce stress that may have accumulated during the day, calm your mind, and settle your emotions.
~Roy Eugene Davis
For most of us, at least twenty minutes of meditation soon after we first wake up works well because the mind is not yet cluttered with the events of the day. Experiment with the time of your meditation session, but then settle on a time to strengthen the habit. In order to promote restful sleep, you may find that a shorter second meditation just before bed time is very helpful. The effort you put in to your daily meditation practice will be rewarded many times over.