DS, who has just turned three, has been toilet trained for about six months now but i have not attempted to go without nappies at night. he seems to produce a huge amount of urine at night and by morning the nappy is often soaked through and the sheets are sometimes wet too. as this is happening regularly i have started wondering whether we might as well start trying to lose the nappies altogether - either way we are spending a lot of time washing sheets. but i don't know where to begin. can any more experienced parents offer some advice?