My 8 month old girl suddenly developed muscle jerks/spasms at I months whenever drowsy but will also wake in the dead of night at least twice per night upset because of her body jerkinging in little clusters. I am hopeful it will stop as she gets a little older but worried because neonatal sleep myoclonus usually presents from birth and clears up by 6 months. Can anyone with adult sleep myoclonus let me know about the beginning / start of their condition, or anyone out there have a baby that had this happen give me more info. Been to her pediatrician twice I don't think he has experience with this.