I sleep talk too, even more so than when i was younger (20 now). I tend to sleep talk more when i have a lot on my mind like lots of things to remember and things to do etc. Similar to Beenee i also speak German in my sleep too, but i know why i do that! It's not harmful really? But if u think it coincides with when u have a lot to worry about then probably it is the things that u are worrying about that u should try and resolve and perhaps the sleep talkin may stop? It is suggested it is linked to dreaming, acting as a mechanism for making sense of what u encountered in the day and that u talk because the the lobe involved with speech and auditory info is not switched off because ure mind is so active. Just a few suggestions ... not sayin they are the definate reasons! T x