Difficulties and challenges at the body mind level do not refer to unhappiness and suffering. 
The complete ending of the me-identification is the end of suffering. Post awakening, the body mind continues to be subject to cause and effect. But the thorn of misery and suffering is removed with the removal of identification. 
The continuation of suffering refers to vasanas; remaining identification which cloud the clarity of being/awareness and confuse the mind. 
Post awakening sadhanas are essential for the stabilization.