Do you believe in sleep training for infants?

Have you done sleeping training with any of your children? What have you tried? What worked or didn’t work? Do you believe in crying it out or something else?

Max is sixth months old right now. He is able to sleep through the night (upwards of 12 hours) but has been getting up several times a night again. I have sleep problems of my own and am unable to sleep during the day. The night waking is increasingly difficult on me. My husband is willing but unable to help on weeknights. I just don’t know what to do anymore, but I can’t function like this.