I was an all day everday weed smoker, (and I'm an alcoholic). The first few days weren't bad, days 4-6 I was incredibily irritable. After about three weeks I started feeling and sleeping normal again. You're right, dreams come back, sometimes very vivid dreams. It's like your brain is making up for lost time.
I'm 5 months sober from pot and booze now because I too have a child that needs a present parent, I've done it in great part by going to at least one AA meeting a week. Since it sounds like pot is your main thing maybe you wanna look into a MA meeting. It will be a room full of people exactly like you.