DD is 18 wks. Thought that feeding to sleep wd give extra calories during the day as she's waking lots at night. Now finding that it's taking AGES which drives me nuts - I seem to spend hours sitting in darkened rooms staring at the wall. Last night she took some 2 hours to go down. So, can I do PU/PD from baby whisperer ? Concerned that she might actually be hungry/need the milk she's been getting before naptimes so she may not respond to PUPD.