Pandiculation

from WordNet (r) 3.0 (2006)

pandiculation
    n 1: yawning and stretching (as when first waking up)

from The Collaborative International Dictionary of English v.0.48

Pandiculation \Pan*dic`u*la"tion\, n. [L. pandiculari to stretch
   one's self, fr. pandere to spread out.]
   A stretching and stiffening of the trunk and extremities, as
   when fatigued and drowsy.
   [1913 Webster]