I feel your pain. My 3 year old was a rockstar sleep from 18-30 months, and then it all fell apart. For the past year he's been getting up in the middle of the night, waking up at 5am, and not falling asleep until after 9 some nights. My 1 year old has finally started sleeping through the night (most nights), but for a while they were tag-teaming us. I definitely don't have sage advice to offer, but I can offer you sympathy and wishes for good sleep!