My son has woke up screaming and crying out of control 2 nights in a row. He seemed "shakey". He was asked many times to tell me what was wrong but repeatedly says "no". He then asked to go "potty" and after about 10 minutes will calm and instantly fall asleep. He has done this a few times in the past a few months apart. these last two times this occured just before sunrise. He does have a known pattern for getting up very early (around 5am - 7am) and getting in my bed. He usually goes to bed around 1 am because that is what time I get him home after work. Is there any thing you could suggest?