The muscles have no tone and no movement during sleep paralysis. Sleep paralysis occurs when falling asleep or when waking up. Vivid terror or stress dreams are associated with sleep paralysis. If the paralysis episodes recur then see a sleep specialist for evaluation. In brief: Sleep paralysis.
Lacrimal sac. The lacrimal sac or lachrymal sac[1] is the upper dilated end of the nasolacrimal duct, and is lodged in a deep groove formed by the lacrimal bone and frontal process of the maxilla. It connects the lacrimal canaliculi, which drain tears from the eye's surface, and the nasolacrimal duct, which conveys this fluid into the nasal cavity.
The lacrimal system consists of a superior and inferior puncta at the medial ends of upper and lower eyelids. These two drain into upper and lower canaliculi. These two canaliculi join to form the common canaliculus. This zone is known as the upper lacrimal system. The common canaliculus inturn leads into the lacrimal sac.