After a day of intensive studying for an exam, the following night's sleep would probably contain
a. the usual amounts of REM and NREM sleep.
b. more REM sleep than usual.
c. less REM sleep than usual.
d. more NREM sleep than usual.
Question 2
Which animals show evidence of REM sleep?
a. all animals
b. mammals only
c. mammals and birds
d. most mammals and reptiles
