Perhaps when you begin sewing after a long day at work you are too tired to register new concepts. Plan to do only 30 mins each day or every other day and reward yourself with your crocheting after.
i love knitting and crochet as well as hand embriodery on applique plus quilting.
i mix and match in timed sections I feel very productive and don't have any undoing which to me is soul destroying with any craft.