Sleep, Oh How I Miss You

We are still battling sleep in our house. It seems to get better for a bit when we try something new then progressively gets worse over time. Last night I was up for 3 hours with a toddler who just wanted to play. He is almost 18 months old now and has only slept through the night a couple times in his life. So tonight we start working on getting E to sleep through the night yet again. I am so tired that something has to be done! Wish us luck. Any tips would be great!