Two sleep disorders are narcolepsy and sleep apnea. With narcolepsy, the person________; with sleep apnea, the person________.
a. has persistent problems falling sleep; experiences a doubling of heart and breathing rates
b. experiences a doubling of heart and breathing rates; has persistent problems falling asleep
c. intermittently stops breathing; suffers periodic, overwhelming sleepiness
d. suffers periodic, overwhelming sleepiness; intermittently stops breathing