What is "pandiculation"

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.

1610s, noun of action from Latin pandiculat-, past participle stem of pandiculari "to stretch oneself," from pandere "to stretch" (see pace (n.)).

n. A stretching and stiffening of the trunk and extremities, as when fatigued and drowsy or on waking, often accompanied by yawning.

n. yawning and stretching (as when first waking up)