Viscoelastic or Viscoplastic Glucose Theory (VGT #38): Applying VEGT or VPGT to Study Fasting Plasma Glucose (FPG) versus Sleep, Weight, and HbA1C to Predict FPG Using Viscoelastic Perturbation Model Over 13 Semi-Annual Periods from Y15H2 to Y21H2 Based on the GH-Method: Math-Physical Medicine (No. 619)