There is an excellent book called "Mothering your nursing toddler" , I forget the author's name but you can find the book at Amazon.com by putting the title in the search engine. It talks a lot about nursing strikes in older babies, how to keep them interested, etc. My DS was exclusively breast-fed and nursed non-stop day and night till he was 12 mnths, then cut back drastically to only morning, nap, and bedtime nursings. He nursed like this till about 20 mnths, then started to lose interest completely and self-weaned by 22 mnths (however, I became pregnant again when he was 17 mnths and I do believe he would have continued bedtime nursings much longer if I hadn't had a dramatic loss in my milk supply). What I'm trying to say is, you can't force them to nurse if they aren't interested, but just because they cut back on the frequency of nursing doesn't mean that they will wean completely. Especially since they do nurse off to sleep and have that sleep association, I would place bets that you will be nursing them for at least another year if not longer.