When our girls were smaller they had "bedtime CD's" that we burned from some of my Music Together CD's, and we put them on and they'd fall asleep to the music - no lightshow, just the music on a player in the dark. Sometimes I might play some quiet New Age or classical guitar for the same basic effect, to help them relax, and it made a great sleep cue for when we traveled and were in a different place for bedtime. Neither of them uses the music now, but for a few years it was nice - they'd even help DH pick tunes to include, and for Christmas we made some Christmas-y ones. Just another option.