Hey there, My 20 month old is waking up at night and is very playful. I don't usually go into see him unless he cries, which is rare, but he's waking up numerous times and making playful sounds, laughing, babbling, yelling. This is just recent, within the past 2 or 3 weeks (i;m so tired, I don't remember, lol). I wonder if he's teething (feeling his second year molars) or something else. Anyone out there experiencing anything similar?