Meditate

The easiest form of meditation is mindfulness. It's as easy as paying attention to your breathing. You can also really look at your surroundings, savor the touch of a tempting texture or fabric, smell your coffee for several minutes, or pick out individual instruments in an orchestral number. Anything that requires that you be really closely connected to this moment in time. Or you can try a more classic form of meditation: candle-gazing, guided meditation, yogic meditation, etc.