PANDICULATION
pandiculation
(noun) yawning and stretching (as when first waking up)
Source: WordNet® 3.1
Etymology
Noun
pandiculation (countable and uncountable, plural pandiculations)
A stretching and stiffening of the trunk and extremities, as when fatigued and drowsy or on waking, often accompanied by yawning.
Source: Wiktionary
Pan*dic`u*la"tion, n. Etym: [L. pandiculari to stretch one's self,
fr. pandere to spread out.]
Definition: A stretching and stiffening of the trunk and extremities, as
when fatigued and drowsy.
Source: Webster’s Unabridged Dictionary 1913 Edition