It seems to me that meditation right before bed is a great way to get your mantra/intention deeper into your mind. Too bad i can't do it before sleep, becouse i feel so rested afterwards that i can't sleep, but from two days i try to experiment with the mid day medidation. I always get sleepy around 3pm, and then i try to go meditate ( i don't have much experience with meditation ), but i do it in slightly more comfortable position, and after i get relaxed and focused i let my tiredness kick in, and let the dream like thought flow through my mind but trying to remain aware.