Setting a motivation before bed is just as important as doing so on waking. Contemplating one’s motivation before doing any activity and making it positive will necessarily make that activity bear positive fruits.
Tonight, as I lay to sleep, I’ll think of beings who do not have a warm bed to sleep in tonight. Refugees from Syria in crowded camps; homeless people in every part of the world; animals displaced from their abodes. None of these beings has a smaller yearning for comfort than me nor is any less deserving of happiness than myself.
Yet, they suffer. Tonight, I’ll cultivate compassion for these beings, wishing that they enjoy my good conditions and happiness and that I take their place in enduring miserable conditions. Going to sleep ‘like this will make this even seemingly passive activity extremely meaningful.