My friend recently told me when she was pregnant her mother and grandmother strongly discouraged middle-of-the-night snacking. She didn't even have so much as a glass of water. Their thoughts were that if you eat in the middle of the night while pregnant, then the baby will become accustom to this snacking routine and, once born, will continue to wake up in the middle of the night. She swears that she followed this advice, and her baby has always slept throughout the night. Supposedly, as a baby, she also slept throughout the night bc her mother also adhered to this rule.