I don't know if I'm wise, but I try hard to practice kindness and ethical deeds. In my meditation community, we are encouraged to share out good deeds because it brightens our own minds, and also the minds of the people we share them with. When we go to sleep, we are taught to have a "sea of merit", which basically means recalling the good deeds we did during the day. That was a revelation to me. Instead of tossing and turning and feeding my worries all night, I can think about the ways in which I practiced kindness and generosity. This combined with no alcohol and minimal caffeine (one cup of tea rather than 5 espressos) has improved my sleep no end.