Sounds like it is! Im no expert but I think I read somewhere that if they happen at a set time every night then u should try and rouse them a little about 10-15mins before its due to happen. They happen coz its the brain getting confused between being awake and asleep as they go thru a certain stage of the sleep cycle. So I guess waking them a little brings them out of the sleep cycle and then they go off into it again without the night terror if that makes sense? Dunno where I read this- sorry, it might b for older kids but could b worth a go? (Obv dont want u to wake up ur LO and then spend forever getting him back off, but a gentle rub of his tummy or something might be enough to wake hime a little and stop it happening?) xx