Valhalla, New York (CNN) Nicole McDonald eases her silver minivan across Bear Mountain Bridge and hooks a right onto the steep two-lane highway. The road twists like a snake up the mountainous incline, an old route where the road's edge blends into beautiful greenery and perilous cliffs overlook the Hudson River. Where your knuckles turn white from clutching the steering wheel and a knot grows in your belly. Nicole makes this trip every day from her home in upstate New York to see her twin sons, Jadon and Anias. The 21-month-old boys are at Blythedale Children's Hospital 40 miles to the south, where they've been undergoing rehabilitation since mid-December. The twins, born joined at the head, captured the world's attention after a marathon surgery to separate them last fall.Rehab has been marked with highs and lows for Jadon and Anias McDonald"It has literally been the journey of sickness," their mother says 
 Question:_ fell asleep in his crib, and she worked to put Anias down.
Jadon