Moms with toddlers who don’t sleep!

Mamas with toddlers that do not sleep, how did/do y’all survive? My son is 2 and has been a terrible sleeper from the beginning. He would wake upwards of 5 times a night until after he was a year old. We had him in a good routine in his own bed in his own room shortly after that and he would only wake once a night if that. Nothing has changed routine or otherwise but for the last month he’s started waking at 12, 1, 2 and sometimes staying up 2-4 hours. I sought advice from our ped who told us to give melatonin at bedtime. This has been like giving him water. My husband and I have made it through some crazy things over the years but this is one of the most trying things on our marriage. No new animals or siblings, we limit sugary foods…Help!