When we were first married back in the early 60's, hubbie was studying (evening course) for his professional qualificlations. BNack then were both in our early twenties and would sit up in bed, lat eat night, with me using his text book to 'quiz him', and both us eating cheese and biscuits. Great times, great memories - and YES he did pass those exams.
Nowdays, if I eat ANYTHING at all later than abot 7 pm, it will cause me a serious disgturbed night.
Can't remember crumbs causing any problems after light out!!!!