My 6 year old has severe RMD. He consistently is up from 11:30pm to 5am rocking. He sleeps very well from 8 to 11:30pm then 5 to 7am. Why every night does he start rocking at the same time and stop at the same time? There is nothing that wakes him up. It's almost as if his REM and NREM sleep is switched. Any help would be great! Thanks, Amy