Answer:

rem

Answer	Crossword Clue
REM	Dream period, for short
REM	Eye action (abbr.)
REM	Sleep letters

REM	Sleep state
REM	Band working on an album called "New Adventures in Hi-Fi"
REM	Sleep phase that Michael Jackson allegedly went 60 days without entering
REM	Athens band
REM	Home to Utah Valley University
REM	Athens, Georgia, band that broke up in 2011
REM	Sleep cycle
REM	"Stand" band

REM	Ad ..
REM	Ad .. (pertinent)
REM	Sign of dreaming (abbr.)
REM	Dream-phase phenom
REM	Michael Stipe's band
REM	Stipe's band
REM	Sleep phenom
REM	M. Stipe's group

REM	Letters of dreamers
REM	Radiation unit
REM	Unit of radiation
REM	Stage of sleep, for short
REM	"Shiny Happy People" band
REM	2007 Rock and Roll Hall of Fame inductee
REM	... sleep
REM	Sleep phase, for short

REM	Polysomnogram letters
REM	Dreamer's acronym
REM	Dreaming acronym
REM	Group with the No. 1 album "Out of Time"
REM	Sleep acronym
REM	Sleep stage
REM	Sleep stage, briefly
REM	Dream indication

REM	Sleep initials
REM	"Losing My Religion" band
REM	"The One I Love" band
REM	Dream indicator
REM	Dreamer's abbr.