ABSTRACT
Behavioral states [namely, wakefulness, slow-wave or non-rapid eye movement
sleep (NREM), and paradoxical or rapid eye movement (REM) sleep] in infants
are one of the most remarkable functions of the central nervous system (CNS)
and good indicators of normal or abnormal development. Behavioral states are
constellations of physiological and behavioral variables that become stable over
time and occur repeatedly in all infants (1). Consequently, changes in these
variables as state development progresses can be discussed only in reference to
age-specific modulations in sleep parameter concordance.
