and neurologic function. Most of these
conditions occur during infancy or early childhood
(see Table 5-1). It is important to recognize these transient
developmental movement disorders, distinguish
them from more serious disorders, and be able to provide
reassurance when appropriate.
Benign Neonatal Sleep Myoclonus
Benign neonatal sleep myoclonus is characterized by
repetitive myoclonic jerks occurring during sleep.1,2
The myoclonic jerks typically occur in the distal more
than proximal limbs and are more prominent in the
upper than the lower extremities. In some cases, jerks of
axial or facial muscles can be seen. The myoclonus can
be focal, multifocal, unilateral, or bilateral. The movements
can be rhythmic or nonrhythmic