My son is 15 months old. They have done several blood tests and other tests to see what is wrong and everything comes up normal, but he sleeps almost his entire day.
He will go to sleep at 9:30 - 10pm at night and wake up between 12pm - 1pm. Then on top of that around 6pm he will sleep for 2-3 hours.
No matter how hard you try he will not stay awake. You try to engage him and the next thing you know he is curled up on the floor sleeping.
My small town pediatrician is out of options.