dear cofty...
Jesus was fully man during His incarnation so there is no reason to believe that His body and how it worked was any different than ours.
The fully God "side" of Him would have to be His pre-existent consciousness born of perfect righteousness, justice, grace, truth and the three O's. The exact same "presence" He shared with the Father before He was born in the flesh.
The Holy Spirit (given at pentecost) is the Spirit of Christ. The Spirit of the RESURRECTED Jesus. (Living in eternity with the Father) The Spirit of Christ points to Jesus (the perfect man) as the Saviour because a man needs a man as a corresponding atonement. A "Spirit" simply can't provide atonement for flesh.
xo