Arrived home at 4 am safe and sound. Sam is in his bed. I'm ready for sleep myself.
Disappointed we couldn't complete the study but confident we made the right choice to end it. After removing all of the wires from Sam's body (which in itself was an ordeal), Sam said in a small voice, "I'm starting to feel a little bit more happy."
Thank you, thank you, thank you for your prayers. I did not feel alone!