The circadian rhythm of tryptophan in breast milk affects the rhythms of 6-sulfatoxymelatonin and sleep in newborn.
2 Getting rhythm: how do babies do it?
3. Perspective: The Long-Term Effects of Light Exposure on Establishment of Newborn Circadian Rhythm
4. About sleep
5. Sleep and Your Child
6. How Your Baby's Sleep Cycle Differs From Your Own